There is a small distinction that I think is worth making: from a photon's perspective, it doesn't travel at all: it exists simultaneously everywhere along its path without any experience of time, so it doesn't even have a concept of speed. This doesn't invalidate the idea of hyperbolic spacetime, but it does fix the problem of trying to measure the speed of light from a photon's perspective.
Great video, but one point is missing: no observer will believe (perceive) himself as travelling faster than c because of the length contracion effect (which is the missing piece here). As you said Speed = Distance / Time. But as you travel close to c the perceived Distance in the travel direction is shrinked (contracted), while time will still pass at normal speed from your point of view (one second per second). Then, an observer travelling close to c will perceive that the distance to destination is almost zero (or exactly zero for the photon), so even if travel time also approaches zero you will never "believe" that you are travelling faster than c. Instead, what you will perceive is that the whole observable universe is now extremely small in your travel direction.
You misunderstand the phenomenon unfortunately still called "length contraction" (which is a rather misleading word): If you consider yourself moving and some stations A and B you are passing one after the other at rest, you don't have to consider the A-B distance "contracted" but rather _your own_ measurement sticks within the direction of your motion whereas you've to consider _your own_ clock running slow. In order to consider your clock running normal and the A-B distance "contracted", you have to consider yourself at rest and A and B forming a convoy successively passing you.
i believe this video combined with a refined redo regarding this topic is probably the correct answer. also, how does multiverse theory factor into a hyperbolic universe. as this theory basically throws the block universe idea out the window which half of the multiverse theories somewhat rely on underneath their principles. So I imagine this explosion is in space and time, is the multiverse. I'm having trouble reconciling this, but hear me out. Somewhat brought up the shining a flashlight thing at the speed of light. Well, what if that's the answer. What if light is infinite until it hits that hyperbolic boundary, and what if that boundary is literally at the edge of the entire "universe". and what if beyond that is just more and more copies of the same thing exponentially expanding, and then the light we see traveling at c, is the light from neighboring universes that already hit the hyperbolic wall , travelled around and into our universes as c light, while our light is travelling at infinity heading towards our neighbor universes where it will slow down to c after passing through the hyperbolic boundary.... would also give some explanation towards virtual particles and why they exists and pop in and out of empty space, because empty space is experiencing hyperbolic convergence from light crossing that boundary. would also mean we only have light because of the multiverse, basically netting the whole concept of light down, like a slow trap.
@@jensphiliphohmann1876 No, true that you can choose to believe either that A & B are moving or that you are moving, but you can't choose your time perception. As an observer your time perception is always 1sg per second, wether you chose to believe that you are moving or not. And ultimately the concept of "the distance from you to a specific point" is just a measurement about how much time needs light to get to that point and come back. If time is passing slower for you then light also needs less time to get to that point from your own perspective, and hence the perceived distance is shorter. In other words: note that Einstein theory is based in the assumption (axiom) that the laws of physics are the same for all observers (including the speed of light) so you can't choose to believe that light speed is different for you than for other observers, because if you remove this axiom then you are not talking about Special relativity.
@@mequavis No, the multiverse theory does not place the universes "one after the other" in a same space. They are not "neighbours". They are just multiple realities in superposition . But don't worry if you can't visualize it or understand it in any intuitive way ( different than mathematics) , neither the proponents of that theory can.
Neat but wrong... If you play with Einstein Rules, then when you take the relative space/time of the photon, not only time is 0 but distance is 0 !!! If you change the relative space/time to say that the photon travelled a distance then you also have to take the time of your new relative space/time then the photon has time in your new relative space/time and speed of light is maintained :D You can't take time from a relative space/time and apply it to the distance of another relative space/time or you just try to build something unreal :D
Never mind that time is defined dimensionally but it is 1D only. Here, he tried to couple the speed of light with the speed of time. And time reversal would require decelerating mass from lightspeed time and then accelerating that same mass into a reversed lightspeed time. Nevermind performing another reversal to reenter our timeline. This reminds me of the experiments that tried to determine whether antimatter would fall "up" or "down" when freed from magnetic confinement. Their stated plan was that if antimatter falls "up" then they would further pursue research to determine whether antimatter travels backwards in time. On the other hand antimatter can be formed as a natural product of radioactive decay, which is the basis of the PET scan. So if antimatter was time-reversed then ordinary radioactive decay could produce time-reversed particles. I didn't follow up on the experiment but it doesn't seem to have generated any major headlines so that must have been a dud. I feel that either time is a dimensionless property which we granted dimensional traits for our own mathematical convenience, or time is not purely 1D but we cannot directly see it and interact with it . In the first case quantum-like properties are the universal norm and physical reality is a soap bubble arising from coincidence. This physical reality of ours could extend for hundreds of trillions of light years, persist for trillions of our years, and be literally nothing of consequence. In the latter case, any deviation of time no matter how small will be a physically separate entity. Time vectors could determine the mysterious numeric values that make our universe work, and only specific vector combinations would give rise to ordered states of energy and matter. It could also tie into things like the uncertainty principle or the way that we factor _all possible and impossible_ interactions to determine how a particle will behave. We're running into questions that are more and more difficult to test, and pretty much every theory combining GR with quantum fields has been an embarrassment to science. Maybe we get our answer soon, maybe it will be another hundred years or we'll even vanish without ever knowing.
One thing to remember about the photons point of view is that not only does time not exist for it, but length contraction is also infinite so from it's point of view, it doesn't go anywhere infinitely quick. Now you have 0/0. Does that help or hinder?
@@marcinnowogorski you just broke my brain. Anything divided by itself is 1 (one of the requirements of identity), but nothing can be divided by 0 without reaching infinity... except 0? I don't know.
Maybe you could shed some light on this question. How can a photon lose energy via redshift when from its perspective time isn't passing? I would guess, (not being a physicist) in order for something to lose(convert) energy some given amount of time would have to pass.
without you even realizing maybe, you are one of the most easy to understand people that share this type of info for the curious people to gather more knowledge,the way u guys display the content is very unique i must say, keep it up because it is people like you, for at least a small groups of mini scientists that gets us hyped up to pursue more knowledge! (i learned to look at quantum physics from a little different perspective thanks to you,and it really helped me!) THANK U GUYS FOR SPREADING KNOWLEDGE
I love to learn new facts about reality in a way that is simple to understand. That is very valuable to me. This is how you get people to actually want to learn and understand
@@LazyRare why ? Simply because he takes an example of a photon inside a relative space/time to give its time value... But then he changes to another relative space/time to give the distance travelled by this photon... If you do that, you just cheat the relativist theory and your new model is totally wrong with what we can observe.
Some things to consider: 1- Can you calculate how much the universe is curved in 4d based on the speed of light or vise versa on your model? 2 - How does your model interact with the principes of relativity like length contraction? 3 - Does dark energy have some relation with hyperbolic 4d space? (Maybe in the same way velocity has) 4 - Make another video explaining more stuff. 5 - If you did explain 1, 2 and 3 on your previous videos, I am sorry. I didn't re-watch them before posting this comment.
Just one little thing to consider and which break this model... If you take relative space/time of a photon to say that time has slowed down to 0... In the same relative space/time, the distance has also shrinked to 0... What he did there, he took the time from the relative space/time of a photon and applied the distance from the relative space/time somewhere on earth... But the time travelled by a photon in our relative space/time is not 0 ... And so his model is wrongly constructed by believing you can play with the distance of one relative space/time and apply it to the time of another relative space/time
Time dilation can only be defined between two inertial frames. Since a photon travels at the speed of light at all reference frames there's no inertial frame that can be defined. How far a photon has traveled depends on your frame of reference, the photon has no frame of reference because it would require the photon to be at rest in its own reference frame but a photon cannot be at rest so we end up with a little conundrum here. It simply does not make sense to talk about photons experiencing or not experiencing time, intuitively it may but not mathematically.
Yes. A photon would see the entire universe shrink to zero size in the direction of travel. So, the speed equation should be 0 miles divided by 0 seconds. My calculator gives the answer 0/0 = 42.
Ah, a 'frame of reference' requires an observer/measurement instrument. So by definition, a photon can not have a frame of reference. Referring to a photon's 'frame of reference', is like saying, 'a rock's tastes buds'.
Another addendum about light is that at the speed of light (in a vacuum) not only you theoretically perceive zero time but due to infinite length contraction you perceive zero space too, meaning when moving at C is like time and space don't exist and they collapsed out of this timeless spaceless place into our universe with mass which in my opinion is the only thing that allows for the perception of both space and time, like space and time are a property of mass and can therefore be perceived only by it
I'm on team Toroidal Universe where there was no big bang as such, but more a persistent continuous big flow. It fixes a whole bunch of astrophysical challenges and observations.
At the speed of light, you can reach any part of the universe instantly.. but your destination will have aged according to the distance you travelled to get there. Theres actually no such thing as time. What youre experiencing is merely passing through the 4th dimension.
well electricity moves at the speed of light, athough I'm not sure if the mechanism in the light bulb immediately turns on as soon as electricity hits it
@@everry3357Yes, it certainly can be slowed down. The constant speed of light is in a vacuum, but when light travels through a more dense medium such as water or glass it slows down. Look up refractive index.
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If causality didn't have a speed limit, all the interaction would have happened immediately and be long done by now. That includes us.
That is actually not true. For example, most computer simulations don't have causality speed limit coded into it, yet they certainly have non instant interactions.
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@@mbrusyda9437 that's cause they have to run on real existing hardware, which is bound by causality...
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@@garycole5941 that's what probably what happened at the great expansion... all things not bound to the speed of light left the universe, like Elvis left the building.
Divided by zero is undefined not infinity. Taking the limit to 0 is another thing. But I assume you overlooked this for the sake of the video, but it makes a dent in the proposition you’re making. As it cannot be zero, only approach. And thus it falls short describing light travelling at 0 time, when the limit never reaches 0.
This, depends on who you ask. It is not just an infinity, however. Since you can approach it from either end. So it could be a negative or positive infinity. Why is sometime is called an undefined infinity. But a lot of leave it as just undefined. But have also seen it be explained as a complex infinity. And computers just return it as an illegal operation, in most cases with an error message. But a computer can pretty much be set up to return any value you wish. (So there are calculators that will give you infinity) One should be careful since 0/0 and 1/0 are not the same thing. 0/0 is generally treated as undefined. (Again, if we look how calculators handles this. The standard Microsoft calculator with Windows 10 (11.2210.0.0) will give 0/0 as undefined, while 1/0 as an illegal operation. Which I find rather funny.)
@@asdfdfggfd Yes, and another problem with the reasoning for infinite speed Astrum makes is that the distance is kept constant, length contraction also happens and therefore cannot be keept constant.
This is only true for mass, and light is massless. Light does not experience time. Light is generally understood to experience its entire life in an instant, ergo _it travels at infinite speed._
The model more or less agrees, in so many words. He's imagining speed as the hypotenuse h of a triangle where both x and y are strictly greater than zero. With x fixed, h approaches infinity disproportionately as y approaches infinity.
@astrumspace, I think there are a few crucial details you're getting slightly wrong, which I'd like to try to clear up. Length contraction isn't mentioned, but it's very important here Take the example of traveling from Earth to Jupiter at the speed of light. Let's assume Earth and Jupiter are essentially at rest with respect to each other in an inertial reference frame, since their actual speeds are negligible compared to the speed of light (I believe you made this assumption as well). You're absolutely right that in your reference frame the journey takes 0 time, due to time dilation. But when you "tried to calculate your speed" (as you phrased it), you divided the distance between Earth and Jupiter as measured in the Earth-Jupiter reference frame by the time your journey takes as measured in your reference frame and concluded that "your speed" is infinite. When we talk about calculating "your speed", we can only talk about your speed in a particular reference frame. But what you calculated uses a distance in one frame and a time measurement in a different frame, which doesn't make much sense So there are two natural inertial reference frames in which we can determine what "your speed" is--the Earth-Jupiter reference frame and your reference frame. (Of course, we can pick any inertial reference frame, but let's just look at these two). Obviously, in the Earth-Jupiter reference frame, your speed is the speed of light, since that was part of the problem definition. What about your speed in your reference frame? Well, in your own inertial reference frame, you're speed is zero by definition! "Your frame of reference" is the reference frame that describes events with you positioned at the spatial origin. But you might ask then, if in your reference frame your speed is zero and the journey from Earth to Jupiter takes 0 time, how does that make any sense? The answer is length contraction, which comes hand-in-hand with time dilation. In your frame of reference, the distance between Earth and Jupiter is 0. Indeed, all the objects in the universe that are traveling at low speeds with respect to the Earth-Jupiter frame are all squished into an infinitesimally thin plane perpendicular to their velocity in your frame of reference. And the speed of Earth and Jupiter in your frame is the speed of light, by the way. Hope that makes some sense!
s=d/t -- ... But isn't it more accurately 0/0? Because of length contraction, if you are traveling at the speed of light, there is no distance to cover. As the Lorenz factor γ(v) gets closer to infinity, the observed length gets closer and closer to zero. It is reasonable to think for something going the speed of light, there is no distance to cover. So d/t becomes 0/0: speed is undefined. I suspect that: Emission and absorption become direct causal interactions. It's like the surface of the sun is directly touching the surface of Jupiter (or wherever.)
What gets me is if you are travelling the speed of light and shine a torch, the light from that torch still travels away from you at light speed, but instead of going twice the speed of light away from somebody that is stationary, that light is still only going the speed of light to them. Something isn’t quite right about light that I can not quite fathom. My head hurts.
No, it doesn't and that's pretty much the thought experiment you see everywhere about the speed of light, although it's usually explained with cars and car lights. If the car is travelling at c, then you won't see it coming, you can't, because the lights also travel at that exactly same absolute speed limit and do not add up.
@@anthonyman8008 Light is definitely not instant. Every bit of light we see in the night sky took years or centuries, or more, to get to us. We aren't seeing the stars as they are now. Traveling at light speed would feel instantaneous to the person traveling, but not to anyone else observing.
I had seen another youtuber trying to explain this, but it was quite confusing. This is, by far, an explanation better suited for the rest of us. I thank you for that. Great video.
Yet again, as in all other explanations I've seen, there is a hidden variable introduced in the 4D concept - time. In our 3D space, any movement is possible because of something we perceive as "time" - without it, it makes no sense to talk about movement. In the 4D is described here in this video, time is described as another space dimension, and movement along this dimension is conceptualized. But then again, there has to be something as elusive as the 3D time, without which it would not be possible to talk neither about movement along the three space dimensions, nor along the "time" dimension. I believe this is an elephant in the room nobody seems too keen to be addressing.
2:35 The distance to Jupiter is zero if you're traveling towards it at c. To a photon the entire universe is thinner than paper in the direction it is moving.
Fun fact! I only ever go with the speed of me, and the universe around me bends to compensate for it. When i walk, the spacetime visibly shifts in the opposite direction, thus preserving physics.
Fun fact: This is how 3D graphics engines for computer games work. Because distances are calculated in floating point numbers, which have the highest precision at the smallest scales. Instead of moving the camera through space, the space is moved around the camera, which always stays at the origin coordinates (0/0/0).
@@NeovanGoth most games actually don't do this. If it is a large open world game where floating point precision would be an issue then yes its probably implemented in some way or another. In versions of minecraft where the farlands exist this is actually very apparent, because movement in one direction becomes very choppy.
@@uku4171 Basically all that use a rasterization pipeline afaik. Rasterization is all about transforming coordinates in world space into coordinates in screen space ("Where on my screen is that point?"), which requires two transformation steps. The first (often called "camera transformation") maps all points from world space into a coordinate system with the camera at its origin. The second one (the "projection transformation") then maps those points onto a 2D plane, which results in pixel coordinates on the screen. To do this has a number ob advantages. As an example, it makes frustum culling very efficient, as one can start by simply throwing away all polygons behind the camera by filtering their points for negative z-coordinates in camera space.
Speed of light is not constant, it is faster near the center of the universe and slower on the outer edges of space. It is not a huge difference, but it is definitely different. This was proven a few years ago.
And light don't travel in a strange line. Also ALL readings are taken ON EARTH, Gods know how many things are interfering the light that arrive to Earth.
I am loving this series more than any recent box office movie. I wish I had all the money in the world to give to you so you can keep pursuing this! Keep it up
For me a way to wrap my head around that universal speed limit is imagining a stone being dropped in the center of a lake being the light source, the particles within the generated wave being photons and their movement being time. at the top of a wave all particles almost stands still, arriving at the edge of the lake without ever being moved from their perspective.
Could you explain further? I'm curious about this analogy, but don't understand what you mean that the particles on the top of the wave feel as if they've never been moved. There's also an issue because in a wave very little of the water actaully moves sideways at all. It moves up and down as the wave moves through it, but it's mostly energy moving sideways towards the shore, not water.
@@erinm9445 It took me half an hour to verbalize my thought process, but i will try to explain further ;D at the top of a water wave particles are "carried". Put something atop a wave and it will stay there (if we are not talking about crashing waves). In my analogy photons are "carried" though time. On the other hand that would mean there are photons at the "bottom" of the wave that move rapidly (photons that experience time forward/backward rapidly) or never reach their destination (stay fixed in time). i have no idea if we would actually able to measure phenomena like this. maybe if we see more doppler redshift than expected? oh and dont forget we are thinking/imagining in 5 dimensional spacetime here ;D Edit: Uuuh...could dark matter actually be photons fixed in spacetime and thats why they dont interact with anything going forward in time? I know it a bit long shot ;D
@@cadfael4598 Well thats one of the many points this analogy breaks apart, since we live on a planet with an atmosphere and everything is in a thick goo compared to the interstellar medium ;)
i've always been told that since we're three-dimensional beings we can only perceive three dimensions of space, but the more i look into it, we definitely do witness four dimensions of space, albeit in a way you wouldn't first consider. if you want to see the fourth dimension, all you have to do is wait. we're always moving through the fourth dimension, but everything around us is too at the exact same speed, so it isn't apparent. but then that got me thinking even further, if light travels through only space and not time, what if you were to assume the inverse? moving through no space, and through time infinitely fast? now, the closest approximation of this would be in voids, not within the influence of galaxy clusters, but would you witness the entire universe receding away from you nearly infinitely fast? throw some cold water on this if need be, but what if this combined with the time dilation experienced in areas of high mass were the cause of what we call dark energy? just spitballing here, but i've been sitting on this idea for a bit.
It is possible to travel only through time, but infinite speed through time is not possible. The speed limit through time is also C. The symbol "c" represents the Speed of Causality. Hence why we use "C" and not "L" . When an object is at rest, relative to your frame of reference, that object's speed through time is C. If that object gains speed relative to you, it's speed through time start to decrease. If that object were able to reach the speed of light, it's speed through time would be 0...just like a photon (of course, and infinite amount of energy would be required)
@@tylerdurden3722 that is a succinct way of describing general relativity as i understand it, yes. the operative word for my thinking is "nearly" infinitely fast [through time, NOT space], as stated in the next sentence.
Have you published a written article on this? You really should publish this information in a journal: even as just a theory, it sounds promising. Also, this may well be the journey our souls are able to travel as ethereal spirits after corporeal death, during occasions when we are not choosing or needing to inhabit light in order to make ourselves known to others.
Light doesn’t think it’s moving at light speed. However, the observer sees time dilation or the light isn’t moving. Light is a massless particle and d/t = s is invalid.
That is very interesting. It’s really cool hearing a theory that explains time dilation happens. You do a great job breaking down complex topics into understandable terms. Thanks!
This is not how time dilation happens, it's completely wrong. There is no mystery in time-dilation, and this hyperbolic nonsense is internally inconsistent, and also has nothing to do with relativity. This is a lie.
1:07 Fascinating, and this theory seems to explain some aspects of relativity, or at least be consistent with it. And it begins to explain what is meant by “space-time.” Your explanation makes me wonder if the theory may also explain the observation of the red-shift of galaxies at great distances, which has been the argument for a universe that is not only expanding, but accelerating. (If this was dealt with in one of the first two videos, pardon me. I have not yet seen them, but will.) My question is, “are we observing red-shift because the universe is accelerating in its expansion, or because the universe’s space-time is curved, and the time dimension makes it look increasingly further away at greater distances in time as well as space?” I may not be explaining the idea well, but I suspect you get my point. Any comments, anyone?
Also, how can it be massless? Is a photon even an entity of its own if it doesn't have mass, or is it just a wake in the electro-magnetic field and all its properties belongs to its surroundings?
@@ingvarhallstrom2306 bottom line there is no such thing as mass, only combinations of potential and kinetic energy with respect to the fundamental forces of nature. even energy itself is not a physical thing, it's a mathematical model for describing how nature works.
@@ingvarhallstrom2306 “Is a photon even an entity of its own[...] or is it just a wake in the electromagnetic field” - Excellent question! Yes, the photon of the Standard Model _is_ the EM field. This is essentially why light can be expressed as a traveling EM wave-carrying exactly the photon's energy, inversely proportional to the wavelength up to the Planck constant (when in a vacuum). “how can it be massless?” is also a very interesting question. I would better turn it around: how can anything be _massive?_ Stuff must get its mass somewhere in the first place... Our universe has a pretty high Higgs field vacuum expectation level, so some particles gain mass directly via the Higgs mechanism. Another way to become massive (in QFT/QCD) is confine energy in a volume. This is how the most of ordinary stuff-largely made of protons and neutrons, as electron mass is tiny in comparison-gain their mass. And free particles that don't interact by the Higgs mechanism have no rest mass in our best theory. Interestingly, only the photon may be solidly called in this category. Gluons are massless too, but always confined, and the SM does not explain the origin of mass of the neutrino. We know they have a tiny mass, indirectly, but there is not a clear-cut explanation for it. They are neither apparently confined, nor indeed gain mass by the Higgs mechanism.
Something that blew my mind about the speed of light, is the fact that it's actual speed, is "kinda an average". Nobody can measure it in only one direction. It's measured from it going to a point and coming back from that point. There's a veritasium video about this.
Ya, when you measure it’s always a round trip measurement, so is it taking 0 time to travel to point b and then 2 seconds back to point a? For a 2 second round trip, or is it 1 second there and 1 second back? We literally have not devised a way to solve this issue. You can’t even build a device to do this because the measurement device always needs a round trip, a capture device at point b does not solve the problem.
@@Trigger200284 what would be wrong with an emitter and a sensor, each connected to a computer with equidistant wires connecting the whole set-up? I would think the computer gets the signals from emitter and sensor of sending or receiving the light with the same delay between both, so we can figure out what the time between send and receive is
@@Trigger200284 All you need is very accurate atomic clocks at two locations that are in sync. At a given time a laser is fired over a long distance at a detector and the time is recorded when it hits the detector. The amount of the delay can be used to calculate the speed of light.
@@my3dviews Doesn't work. You just move the uncertainty to be a function of your ability to synchronize clocks over a long distance. Something that, practically speaking, you would probably do with light (eg: fiber optics).
@@TheAroVII Also doesn't work for a similar reason to My3dviews' idea - you've just shifted the problem to be a function of your ability to measure "equidistant" which again, practically speaking would likely be done with light (laser ranging or similar).
You've done a great job showing what has already been known through special and general relativity in a beautiful visual way. I'm pretty sure modern physicists aren't surprised by the concept of the universe's time dimension featuring hyperbolic geomerty because special relativity ACTUALLY uses the Minkowski model which is a hyperbolic geometry model.
Came here to say this. I appreciate the nicely produced video but maybe these guys should spend less time making TH-cam videos and more time cracking open like an intro GR textbook.
@@iguananaut - Some might say that the phrases "GR textbook" and "intro" are a contradiction in terms. Well, I jest of course, there are a dozen or more good intro books to General Relativity. In fact, at one point I spent many hours compiling a long list of GR books and trying to double-rank them in two orders: (a) best to worst in my rough estimate, and (b) order in which to read the best ones in terms of gentle/doable to tough-job-reading-it-due-to-the-math-involved. If I could only remember the file name ... If I find it, maybe I'll come back and post a select subset. That being said, I do appreciate the effort made here by all involved, including video author and various discussers. Even if the approach taken in the video turns out to be a complete fail in the end, the process of trying to read/understand everyone's take on the raised issues does make you think, and that stimulus for thinking might end up in yourself (the reader/viewer) understanding a big subset of GR concepts whose road would not have been traveled by you, had the video and commenters not been there. So thanks to all.
A very interesting explanation! I am very curious if you could calculate the curvature of space based on this theory. I also wonder if perhaps this can explain dark energy since everything is moving forward in time that the hyperbolic space would cause new space to appear between objects.
Another great video from Astrum! Instead of infinite velocity, this video made me think a better term is "zero wait" travel. Photons essentially teleport, according to their own "clocks."
Photos do _not_ have clocks. The very concept of a clock requires change, but massless particles do not experience change. This is why we know that neutrinos must have mass: The can change between flavors (we can measure this), hence they must experience time, hence they must have mass. For a photon however, time has no meaning.
@@NeovanGoththat’s completely untrue. Time absolutely has a meaning for photons. You can’t just take an unphysical limit of relativity equations and weave a story about photons not experiencing time.
Here's a question that may seem nonsensical but it might be the right question. What if space doesn't require space? Like inside a black hole isn't infinite density but infinite space?
According to GTR, spacetime is flexible like a chewing gum. Chewing gum always requires chewing gum! And inside a black hole, spacetime density is not infinite. In physics, infinity means beyond our understanding & calculations!
Well why would it accelerate. It is not ramping up an energy output like an engine revving up, and it has nothing in its way to slow it down, nor any mass. It is just a singular packet of energy. Photons come from electrons. But only when an electron is forced into a high orbit, and since the electron wants to naturally fall back to its normal orbit, it does. But in doing so, it releases the excess energy as a photon. This is how all light is generated. Electrons are elementary particles like quarks, so they aren't divisible like protons and neutrons are (which are made of quarks), which means that energy has to become something, and so it becomes light. The mind blowing thing is if we were ever to figure out a way to easily manipulate electrons and protons and neutrons, we would become masters of energy and matter, able to change or create any element, and able to create anti matter just as easily. Just these 3 basic things, if we could manipulate them with the wave of a wand or like a microwave you can just place some matter in and alter it. In many ways we already do exactly that, just not at the speed and volume and ease we would like. It would be the singular greatest discovery of humanity.
@@peoplez129 I think we are in early stages of what you’re describing. Alchemy at a subatomic level. Given enough time and resources we could have almost Godlike powers over reality. At least on a local scale. Science fiction has a way of becoming reality. Humans are truly amazing.
The statement that from the photon's perspective, its speed is infinite is incorrect. That would indeed be the case if, in the photon's view, it were covering any actual physical distance in zero time. However, as the photon is moving through space at exactly light speed, from its own perspective, it remains stationary. In fact, even that would be a misnomer, as "stationary" implies being immobile in the midst of a stretch of space. To the photon, however, all space along its line of travel is contracted to zero, so there is no point of departure, nor of arrival. All it ever knows is the eternal here and the eternal now (in other words, it is a "fully illumined being" ☺).
An easy way to understand time dilation is by thinking of every interaction between particles as a tick on a clock. The fastest these particles can interact is at the speed of light, so if you are traveling near the speed of light then each particle will need to cover a greater distance in space to interact. To you, time ticks at a seemingly normal rate because the interactions that mediate your existence still happen as fast as they possibly can. From someone else's perspective you stretch out because the particles in the back must cover great distances in space to catch up to the particles in the front.
You're the first person I've seen that understands it this way... this is the way I explain it for some time now... I don't know if its accurate or conform to the whole theory though but it seems to work and to be concrete... even if the maths are necessary if you want to do actual calculations. Interresting.
@@lovecontemplation8607 Space around you contracts because the particles that make you up interact over greater distances in space, so space will seem to contract from your perspective.
another fun thing to think about: photons travel at the speed of light. and as this video has reminded us, time stands still when you travel at the speed of light. so a photon experiences no time. in another word, from a photon's perspective, it's annihilated the very moment it's created. so, to us, photons exist. to a photon, it doesn't.
I don't care if you are right or wrong just that you are attempting to make sense of it congratulations. Some great videos fo sho Keep diggin to the deepest depths of the universe.
You are always in motion, and the length of your motion vector never changes. All you can do, is change the direction of your motion within the 4D space-time environment. Your motion vector is identical to the motion vector of a photon of light. The only difference is that your direction of travel is NOT merely across space. And so if you create a simple geometric representation of your ongoing motion within Space-Time, a geometry which is composed of your motion vector and your length scalar combined, you can use it to derive the Special Relativity mathematical equations in mere minutes.
@SnoopyDoo Not to an external observer, but to the light it gets there instantly due to time dilation. It has to do with the frame of reference that you measure it from.
@Polaris431It would not appear simultaneously at every point in the universe, or for that matter at any two points at all to an outside observer. Outside observers clocks would be running normally, the time only dialates for those traveling aboard the vessel going the speed of light. In other words, for example if you, the outside observer fixed a telescope on an object one light year away and someone else traveled to that object at the speed of light, from your perspective you would not see them arrive for one year, but to them they would get there instantaneously and would not age one year as you did.
interesting! Did you also consider the possibility that particles can actually travel faster than that limit but those that do are not observable to us anymore cause they escape from our view.. and the limit is not the max light speed limit but the limit of velocity of particles that can still be observed? Just a thought 🤔
Min 3:00 the formula for measuring velocity of light is not length / time but rather Lorentz transformation of length / dilated time which is constant. An object who moves at the speed of light contracted the space and dilated the time.
I questioned the speed limit once quantum entanglement was proven to be real. Einstein described it as “spooky action at a distance” when changing the state of one particle caused the other particle to instantly change state, bypassing the SOL limitation. Either something was passed from one to the other, or they are one particle existing in 2 places.
Actually as of today's interpretation it is "one" particle or better put the moment they get entagled the 2 function merged and turns into one wave function that collapses upon observation. However the speed of light or speed of information isn't broken here. Sure the wave function collapses when observer A makes the observation but B will not know or won't be notified either that A did the measurement unless A tells B - and that information/notification propagates with the speed of light.
Ironically (and IMHO) that can only be explained by accounting for light's "proper time" (subjective time), which is, as explained in the video, infinitely fast. A photon is simultaneously everywhere in its trajectory and that's why "spooky action at a distance" happens, even going backwards in time (DCQE experiment), for the photon there's no past or future, only eternal, instantaneous, now. Not even Einstein could understand that, so worry not, but it directly seems to derive from Einstein's Relativity that it must be, it is, thatway.
c is really just the propagation speed of quantum fields, though, (and a programming language, but thats not important right now), and quantum entanglement happens outside of this field.
Thanks for making this point a little easier to understand, I will share this video with people who just don't really get what I'm trying to say about light speed and that technically from the point of view of the traveler there isn't really a speed limit and you can essentially travel at almost any speed as seen by the traveler only
This has to be one of the most enlightening videos on TH-cam. Please make a follow up video! I felt like you were going too fast for me. I would love an even more detailed view of this hyperbolic nature of reality!
The "Speed of Light" is not a speed and not a property of light. It is a conversion constant that compensates for measuring space and time with different units. C=100 cm/m if you measure distance in centimeters and time in meters. When we measure the speed of light, we merely discover the conversion constant between our space units and our time units.
⚠ Philosophical rant ahead It is really intriguing the implications of this theory and how some concepts like entropy can be explained in this light!! Here I mean entropy from a life experience point of view. Or how James Clear put it " It is the natural tendency of things to lose order. Left to its own devices, life will always become less structured. Sand castles get washed away. Weeds overtake gardens." Imagine that this is caused by the true nature of space itself! On how things always and will ever do drift apart because space lines always drift apart, and we are constantly moving through space being teid to our planet, our solar system and our galaxy! Isn't that fascinating! and what if we were able to some how counter that by - here me out on this - breaking free from moving through space!!! I mean this might need for us to break free from our galaxy's gravitational pull, or actually our Supercluster gravtional pull!! But only then, we might, achieve immortality!!! Only then we might be Gods! or meet God!
7:22 "You would need to push against something to change your time dimension" In a sense something exist... antimatter. antimatter is seen as time reversed matter it means that it's behaviour is like matter was moving backward. When you collide with antimatter if the same mass and particle its like you are colliding with something moving in your opposite direction, this can be seen then as being pushed into only the time dimension and become a photon or other massless particles. It's like when you encounter an antimatter you, you collide in the time dimension and become massless with no time
Antimatter isn't backward in time, it has opposit spin and charge, basically it ls electrons are positive and its protons negative. If it was traveling back in time it should oppose gravity and all other forces.
@@davidgavranic5044 gravity doesn't repel things, in fact, antimatter attracts to massive objects in the same way, and was tested to do so years ago. And having an opposite charge and spin is exactly like being reflected against time axis so...
@@davidgavranic5044 it doesn't literally travel back in tim but it behaves like time reversed matter, in quantum mechanics. What it does is essentially move in opposite direction of matter if it were in its same position, I thought to add this in my comment but didn't want to make it too long by doing so. This isn't even an hypotesis it's just an observation that two things like a positron and an electron that behave in the opposite manner through time when collided release something that is massless (essentially without time) although if moving fast they can produce other particles with mass. Its interesting how it looks like there is some kind of conservation of momentum through time and it might be linked with mass, mass being the reason time space and consequently speed exist
thank you for elaborating on antimatter. I was hoping someone would bring it up. physicists ponder why we don't see equal amounts of matter and antimatter in our universe. this video begins to explain that.
Great video and a great subject. You have forgotten to mention that the speed of light you have showed is in a vacuum. It will be different depending on the media the light is traveling through
That's a really good point - so does e.g. glass or famous caesium curve space time differently? I'm sure you could do the math and find some curve for every medium. That means: we need to propose an experiment that you can proof or disproof or else it's just playing with functions
These ideas apply LOCALLY, not globally. It's entirely possible there exist FTL manifolds where information can be transferred instantaneously, which would appear to occur before causation to a particular observer. i.e. time travel in the "reverse" direction. (Papers have been written on this."Back to the future" in Physical Review is one of many many FTL papers.)
Very interesting video. What is crazy is that the objects we observe in the universe, travels with different speeds, and thus different times. Gravity is also due to time difference close to massive objects I think.
This seems to make a lot of sense to me and it's very appealing. Like infinite speed still doesn't really make sense but neither does the speed of light to me but this makes it seem very clean and makes more sense than anything else. It reminds me of a Science Asylum video I watched once explaining how mass curves spacetime just by slowing time near mass and the differential between 2 points on an object near a mass traveling at a velocity curves the object toward the mass (i.e. gravity) as an inevitable consequence of the time dilation. If the speed of light makes sense, then the photon clock thought experiment that Science Asylum also has a video on that explains Special Relativity by looking at the velocity of the clock and the photon inside with the assumption that speed of light is constant to external observer also makes that seem very clean and inevitable. It's all very strange, but I like it because it seems consistent at least and any attempt I could make myself to understand these sorts of questions would lead to worse paradoxes if anything
I have often thought that if you did reach the speed of light, you would never be able to push the stop button because no matter where you are pointed or how far away it was, you would instantly be there... So, if you were pointed at some thing, you would hit it the exact moment you reach light speed. More interesting is if there was nothing in your way. You would basicly be in suspended animation forever. Here's another point about time dialation. The faster you travel, the more mass you gain. This would indicate to me that, at some point, you would become a black hole; likely well before you reached the speed of light. However, the more mass you gain, the more gravity you would have, the slower time would go for you, as well. You know, until you become a singularity. Maybe, all the black holes in the universe are alians who acheived close to light speed travel.
photon has no mass. So you can go as fast as you want, the photon will stay with no mass :D And as you would need energy to move an existing mass, the faster you move, the larger the amount of energy you need to even go faster and so on until the energy to reach speed of light become infinite. Also, the object you move will expand in length making the mass not crossing the point of singularity --> sorry but it indicates to me, you wouldn't become a black hole :D
There is no speed when you’re in the realms of “space time math”. Hu -mons have to come to grips with this fact, that Self existence isn’t bound by the absolute and it microscopic limits as you all perceived them. In one breath you fathom and could quantify a discovery and in the next breath, you develop this belief that your minds are too small to adopt an imbued awe, so unbelievably unbound and incommensurable, that you allow your self to digitize its vastness as the infinity. The problem is you’re counting in directions, time and space. The nature of your universe doesn’t require extreme focus. No wonder why your world hasn’t evolved into a type 1 civilization to say the least. The human mind only needs a thought or an idea to be anywhere in the universe at will… and no invariant or Pettis integral based math could “shape” that reality. The spirit and or soul of man is what you ascribed as infinite, how then it is quantified? Seeing that you have foreknowledge that the absolute is incalculable. If that is true in your minds, then reality shapes itself according to your limited beliefs, which means that God is therefore a man.
It's not a law of physics, they're more of... suggestions of physics. Strong ones yes, but still just suggestions. Unwarp spacetime, warp spacetime more, ripple it. Lots of ways to do that. And then there's the ""laws"" of thermodynamics, but really they're just the suggestions of thermodynamics. Creating energy isn't allowed is not a rule, it's a challenge.
Question then; If light is an oscillating electromagnetic wave, and light experiences no time. Then if it looked down at itself what does it see? oscillations require the existence of time.
I just described it to someone else, as in the video. Time never actually stops for the photon. It becomes infinitely close to zero, but never actually reaches zero time. The limitations of math force us to round it to some "non infinite" value which is "almost" indistinguishable from zero. If we allow the photon to exist for long enough (billions. trillions of our years) then the wave propergation should begin to emerge and become measurable by our limited tools. (Opinion)
Alex, I’d love to hear your thoughts on multiple big bangs (not just one big bang but serial “bangings”, if you will). I fancy the notion that we’re still thinking a bit too geocentrically and that we actually dwell within a wave or ripple being flung away from a much grander structure than we’ve been giving Momma Universe credit for the ability to comprise. In similar fashion to a CME wafting violently from the surface of a star, our observable universe could merely be a section of such a ripple, and one of many which expand concentrically, or at least in succession, from some ineffable surface (which I further like to imagine as being curved at the value immediately adjacent to zero degrees, y’know, just to bake the old noodle some more). To me, this makes dark energy merely the crowding and rebounding of big banging.. wave.. ripple.. layers.. (I’m truly undecided upon their nomenclature).. which, like ripples in a pond, travel outward, periodically pushing and periodically pushed, gliding steadily toward oblivion (or perhaps I mean evaporation). Anyway, I like to suppose the present acceleration we witness in the universe could simply be an indication that we’re in an aging ripple with a younger one directly at our heels. Okay. Thank you for hearing me out, if that be the case. Cheers! -Phill, Spokane
That's something I agree with, ie that the so-called "big bang" is actually one of many "small bangs". After all, how do we know what is big and small when it comes to bangs?
reminds me of cixin liu's three body problem. the idea that the speed of information is a direct byproduct of the geometry of reality is very interesting. in TBP, our three dimensional reality is actually a much reduced version of a ten dimensional perfect universe with near instantaneous causality. each time the spatial dimensions were lowered, the speed limit of existence lowered proportionally as a result. the different constants of nature being expressions of a base geometry of reality has always been tantalising and interesting to me. i would definitely be unsurprised if some variation on this idea turned out to be true, but was itself nested within higher geometries that gave rise to even the sort of fundamentality you describe. (i don't mean strings though. i find them a very contrived and uncompelling interpretation, even if the ideas themselves are beautiful and elegant. i definitely subscribe to the idea that their attractiveness has been a trap and a brain drain)
The way that I understand it, the speed of light is not an upper limit, but rather an asymptote. Theoretically, the model doesn't prevent something moving faster than the speed of light. But nothing that does could slow down to lightspeed in the same way that nothing made of regular matter can reach light speed.
Interesting theory but did you take into account, during your calculations, that light cannot escape a black hole? If the speed of light is variable in a vacuum and can exceed 300,000 km per second then we would be able to see black holes, not just their effects on other objects. Just a thought.....
IIRC light can't escape a black hole because the gravity curves space so extremely that every path a photon could take (and it will always take the shortest distance between 2 points) curves back into the black hole. I believe that light can technically escape if it is traveling exactly parallel to the 'poles' of the black hole, but the light itself is infinitely red shifted. Things also get more red shifted as they approach the event horizon. Even though light doesn't have rest mass, it is affected by gravity as it is affected by the curvature of space-time caused by that gravity. I've heard another explanation that light can't escape because time stops past the event horizon and light needs time to move (even though from the photon's point of view, its travel time is instantaneous?), and the escape velocity past the event horizon is larger than the speed of light, which might be true but isn't the reason why light can't escape.
This doesn't impact the overall hypothesis, but in the beginning something was oversimplified. x/0 is not infinity. It's undefined. lim x/y as y approaches 0 is infinity. Two different things. The word limit is used later, but should have been introduced in that early example.
It would apply if you were attempting to measure the position AND speed of a particular photon. Either value can be measured to good accuracy if the other is sacrificed.
Well I've always thought about C as the speed of time itself. In fact if you look at E=mc2, if you consider C as time then you can see why mass or energy dilates time.. It's because Time, Energy, and Mass are all equivalent and the true nature of the universe is that it wants to remain in balance. By increasing energy, either time or mass has to be reduce. By increasing mass, either energy or time has to be reduced. In both cases we see real world time dilation.
I think light is the data storage (hard drive) of the sim we live in. I made a video about this. I'm glad you're thinking about things outside the box. That's what we need more creativity.
So fun note, the person moving at high speeds ALSO won't calculate their speed as greater than the speed of light, because an oft overlooked facet of relativity is distance contraction- that is, the faster you go, the shorter you measure things within the vector of your velocity. Light would not perceive itself crossing infinite distance in zero seconds, but rather a very boring zero distance in zero seconds, which even I can do. It's only when we return to subrelativistic speeds that we believe we've travelled a greater distance, but also over a greater time, so in no perspective does it seem like we're breaking the speed limit
From the "light" perspective, the universe would be moving at the speed of light, and thus would appear to have flattened completely in the direction the light is traveling. So from light's perspective, it is traveling at the speed of light. It just has 0 distance to cover. It's also weird because from its perspective, it is destroyed as soon as it's created, regardless of how long it lives. Mass might mess with spacetime. But not having mass messes with everything.
This proves the theory that I thought of a long time ago that causality itself has to be faster than the speed of light for the light itself even to propagate being supposedly the fastest thing in the universe.
We don't need gobs of energy to increase our speed. Speed is relative. So we get to include the vector sum of all existing applicable speeds: Earth's rotation, Earth's orbital velocity, the speed at which our solar system moves through and with our galaxy, and so on. In fact, we can do this: just identify whatever object is moving away from us fastest; that speed is OUR speed relative to it. We get to call that our speed, same as if we once long ago accelerated from it to our current relative velocity.
My brain hurts. I don't understand most of this. I feel so close in understanding then...nothing. Replaying the segment repeats the experience. I need a more dumbed down 'For Dummies' version. >_
Maybe it is more simpler to consider that Time is the entity who give Space the 3-rd dimension. And maybe speed of light is dependent by Universe's state if we consider that complexity or entropy is increasing and the "processing power" of the Universe is constant.
I feel I must point out: Actually if you began suddenly traveling toward Jupiter at the Speed of light: 1 - You would perceive that zero time had passed. This much is correct. 2 You would observe that you have traveled 679 million Km. This part is false. Due to length contraction, you would actually observe that you had traveled zero kilometers. A photon does not perceive that it is traveling infinitely fast. It perceives that everything in its direction of travel is right next to each other. Now: Something I think you were hinting at and which is interesting is that, all the equations of special relativity that describe length contraction or time dilation contain some version of 1-(v^2/c^2) or in other words, they contain the Pythagorean theorem, with C being the length of the Hypotenuse, and time and distance forming the opposite and adjacent legs of the triangle. After observing that in the math, I never could quite decide what to make of it. But I feel like you might have a chance of figuring out what it means.
If you have two points anywhere in the universe, the object that is traveling will never arrive at point B prior to leaving point A. If you have said object returning to point A, the same applies.
To be frank, calculators do not throw an error due to the answer being infinity if you attempt division by zero. Zero is a null value, which basically means it has 'no' value, it is simply nothing. Trying to divide any number by nothing is obviously (one would think) impossible, so an error is thrown.
The real bugger about x/0 being infinite is that it also extends to negative infinity. This is why it is considered undefined, because you don't know which you will get.
Alex McColgan deserves governmental funding for his excellent videos. Way better than most things produced by public broadcasting, I feel privileged to get to watch these videos for free.
There is a small distinction that I think is worth making: from a photon's perspective, it doesn't travel at all: it exists simultaneously everywhere along its path without any experience of time, so it doesn't even have a concept of speed. This doesn't invalidate the idea of hyperbolic spacetime, but it does fix the problem of trying to measure the speed of light from a photon's perspective.
Wouldn't the calculation be different to an external observer not from the perspective of the photon?
@@charlesmiller8107 sure, but the video is trying to make an argument based on measuring the speed of light from the perspective of a photon.
Great video, but one point is missing: no observer will believe (perceive) himself as travelling faster than c because of the length contracion effect (which is the missing piece here). As you said Speed = Distance / Time. But as you travel close to c the perceived Distance in the travel direction is shrinked (contracted), while time will still pass at normal speed from your point of view (one second per second). Then, an observer travelling close to c will perceive that the distance to destination is almost zero (or exactly zero for the photon), so even if travel time also approaches zero you will never "believe" that you are travelling faster than c. Instead, what you will perceive is that the whole observable universe is now extremely small in your travel direction.
You misunderstand the phenomenon unfortunately still called "length contraction" (which is a rather misleading word): If you consider yourself moving and some stations A and B you are passing one after the other at rest, you don't have to consider the A-B distance "contracted" but rather _your own_ measurement sticks within the direction of your motion whereas you've to consider _your own_ clock running slow.
In order to consider your clock running normal and the A-B distance "contracted", you have to consider yourself at rest and A and B forming a convoy successively passing you.
i believe this video combined with a refined redo regarding this topic is probably the correct answer. also, how does multiverse theory factor into a hyperbolic universe. as this theory basically throws the block universe idea out the window which half of the multiverse theories somewhat rely on underneath their principles. So I imagine this explosion is in space and time, is the multiverse. I'm having trouble reconciling this, but hear me out. Somewhat brought up the shining a flashlight thing at the speed of light. Well, what if that's the answer. What if light is infinite until it hits that hyperbolic boundary, and what if that boundary is literally at the edge of the entire "universe". and what if beyond that is just more and more copies of the same thing exponentially expanding, and then the light we see traveling at c, is the light from neighboring universes that already hit the hyperbolic wall , travelled around and into our universes as c light, while our light is travelling at infinity heading towards our neighbor universes where it will slow down to c after passing through the hyperbolic boundary.... would also give some explanation towards virtual particles and why they exists and pop in and out of empty space, because empty space is experiencing hyperbolic convergence from light crossing that boundary. would also mean we only have light because of the multiverse, basically netting the whole concept of light down, like a slow trap.
@@jensphiliphohmann1876 No, true that you can choose to believe either that A & B are moving or that you are moving, but you can't choose your time perception. As an observer your time perception is always 1sg per second, wether you chose to believe that you are moving or not. And ultimately the concept of "the distance from you to a specific point" is just a measurement about how much time needs light to get to that point and come back. If time is passing slower for you then light also needs less time to get to that point from your own perspective, and hence the perceived distance is shorter.
In other words: note that Einstein theory is based in the assumption (axiom) that the laws of physics are the same for all observers (including the speed of light) so you can't choose to believe that light speed is different for you than for other observers, because if you remove this axiom then you are not talking about Special relativity.
@@mequavis No, the multiverse theory does not place the universes "one after the other" in a same space. They are not "neighbours". They are just multiple realities in superposition . But don't worry if you can't visualize it or understand it in any intuitive way ( different than mathematics) , neither the proponents of that theory can.
@@javiej there's definetly several different ways the multiverse could or can be in existence in.... That's only one possible theory....
Fun perspective. In this model, C is essentially a coefficient for how curved the universe is. Neat!
Neat but wrong... If you play with Einstein Rules, then when you take the relative space/time of the photon, not only time is 0 but distance is 0 !!! If you change the relative space/time to say that the photon travelled a distance then you also have to take the time of your new relative space/time then the photon has time in your new relative space/time and speed of light is maintained :D
You can't take time from a relative space/time and apply it to the distance of another relative space/time or you just try to build something unreal :D
Never mind that time is defined dimensionally but it is 1D only. Here, he tried to couple the speed of light with the speed of time. And time reversal would require decelerating mass from lightspeed time and then accelerating that same mass into a reversed lightspeed time. Nevermind performing another reversal to reenter our timeline.
This reminds me of the experiments that tried to determine whether antimatter would fall "up" or "down" when freed from magnetic confinement. Their stated plan was that if antimatter falls "up" then they would further pursue research to determine whether antimatter travels backwards in time. On the other hand antimatter can be formed as a natural product of radioactive decay, which is the basis of the PET scan. So if antimatter was time-reversed then ordinary radioactive decay could produce time-reversed particles. I didn't follow up on the experiment but it doesn't seem to have generated any major headlines so that must have been a dud.
I feel that either time is a dimensionless property which we granted dimensional traits for our own mathematical convenience, or time is not purely 1D but we cannot directly see it and interact with it . In the first case quantum-like properties are the universal norm and physical reality is a soap bubble arising from coincidence. This physical reality of ours could extend for hundreds of trillions of light years, persist for trillions of our years, and be literally nothing of consequence. In the latter case, any deviation of time no matter how small will be a physically separate entity. Time vectors could determine the mysterious numeric values that make our universe work, and only specific vector combinations would give rise to ordered states of energy and matter. It could also tie into things like the uncertainty principle or the way that we factor _all possible and impossible_ interactions to determine how a particle will behave. We're running into questions that are more and more difficult to test, and pretty much every theory combining GR with quantum fields has been an embarrassment to science. Maybe we get our answer soon, maybe it will be another hundred years or we'll even vanish without ever knowing.
One thing to remember about the photons point of view is that not only does time not exist for it, but length contraction is also infinite so from it's point of view, it doesn't go anywhere infinitely quick. Now you have 0/0. Does that help or hinder?
@@WalterBislin So is it more to say that from the photon's point of view it is everywhere all once, at least within the direction of it's travel?
@@cervantes01 I think that's fair to say at least from the photons point of view. I have also heard it put that a photon has no frame of reference.
is 0/0 = 1 ?
@@marcinnowogorski you just broke my brain. Anything divided by itself is 1 (one of the requirements of identity), but nothing can be divided by 0 without reaching infinity... except 0? I don't know.
Maybe you could shed some light on this question. How can a photon lose energy via redshift when from its perspective time isn't passing? I would guess, (not being a physicist) in order for something to lose(convert) energy some given amount of time would have to pass.
without you even realizing maybe, you are one of the most easy to understand people that share this type of info for the curious people to gather more knowledge,the way u guys display the content is very unique i must say, keep it up because it is people like you, for at least a small groups of mini scientists that gets us hyped up to pursue more knowledge! (i learned to look at quantum physics from a little different perspective thanks to you,and it really helped me!) THANK U GUYS FOR SPREADING KNOWLEDGE
I love to learn new facts about reality in a way that is simple to understand. That is very valuable to me. This is how you get people to actually want to learn and understand
What he told is totally wrong and can't be taken as a valid theory :D
@@TheCentaurywhy
@@LazyRare why ? Simply because he takes an example of a photon inside a relative space/time to give its time value... But then he changes to another relative space/time to give the distance travelled by this photon... If you do that, you just cheat the relativist theory and your new model is totally wrong with what we can observe.
Some things to consider:
1- Can you calculate how much the universe is curved in 4d based on the speed of light or vise versa on your model?
2 - How does your model interact with the principes of relativity like length contraction?
3 - Does dark energy have some relation with hyperbolic 4d space? (Maybe in the same way velocity has)
4 - Make another video explaining more stuff.
5 - If you did explain 1, 2 and 3 on your previous videos, I am sorry. I didn't re-watch them before posting this comment.
Same thought ! The point 1 is for me all what matters.
Just one little thing to consider and which break this model... If you take relative space/time of a photon to say that time has slowed down to 0... In the same relative space/time, the distance has also shrinked to 0... What he did there, he took the time from the relative space/time of a photon and applied the distance from the relative space/time somewhere on earth... But the time travelled by a photon in our relative space/time is not 0 ... And so his model is wrongly constructed by believing you can play with the distance of one relative space/time and apply it to the time of another relative space/time
Time dilation can only be defined between two inertial frames. Since a photon travels at the speed of light at all reference frames there's no inertial frame that can be defined. How far a photon has traveled depends on your frame of reference, the photon has no frame of reference because it would require the photon to be at rest in its own reference frame but a photon cannot be at rest so we end up with a little conundrum here. It simply does not make sense to talk about photons experiencing or not experiencing time, intuitively it may but not mathematically.
Yes. A photon would see the entire universe shrink to zero size in the direction of travel. So, the speed equation should be 0 miles divided by 0 seconds. My calculator gives the answer 0/0 = 42.
@@afriedrich1452 My calculator gives the answer 88 Mph.
@@etsequentia6765 You are right. 88 mph is 142 kph. My calculator must be faulty and dropped the first digit.
Ah, a 'frame of reference' requires an observer/measurement instrument. So by definition, a photon can not have a frame of reference. Referring to a photon's 'frame of reference', is like saying, 'a rock's tastes buds'.
@@afriedrich1452 Great Scott!
Another addendum about light is that at the speed of light (in a vacuum) not only you theoretically perceive zero time but due to infinite length contraction you perceive zero space too, meaning when moving at C is like time and space don't exist and they collapsed out of this timeless spaceless place into our universe with mass which in my opinion is the only thing that allows for the perception of both space and time, like space and time are a property of mass and can therefore be perceived only by it
Absolutely!
I'm on team Toroidal Universe where there was no big bang as such, but more a persistent continuous big flow. It fixes a whole bunch of astrophysical challenges and observations.
You'll like Colin Rourke's "Geometry of the Universe"
no it doesnt, if it did we'dbe using that as the standard model.
At the speed of light, you can reach any part of the universe instantly.. but your destination will have aged according to the distance you travelled to get there. Theres actually no such thing as time. What youre experiencing is merely passing through the 4th dimension.
I remember when I was a kid I thought the speed of light was how long it takes my lamp to come on after I hit the switch 😂
Well you aren't that wrong
well electricity moves at the speed of light, athough I'm not sure if the mechanism in the light bulb immediately turns on as soon as electricity hits it
@@chickennuggetman2593 wouldn’t friction from the cables lower that velocity quite a bit?
@@nunohs3371 speed of light does cannot be slown down or speed up it a constant light's photons don't lose energy.
@@everry3357Yes, it certainly can be slowed down. The constant speed of light is in a vacuum, but when light travels through a more dense medium such as water or glass it slows down. Look up refractive index.
If causality didn't have a speed limit, all the interaction would have happened immediately and be long done by now. That includes us.
It has! You haven't realized it.
That is actually not true.
For example, most computer simulations don't have causality speed limit coded into it, yet they certainly have non instant interactions.
@@mbrusyda9437 that's cause they have to run on real existing hardware, which is bound by causality...
@@garycole5941 that's what probably what happened at the great expansion... all things not bound to the speed of light left the universe, like Elvis left the building.
@ eh, guess you don't understand how physics simulations work.
Divided by zero is undefined not infinity. Taking the limit to 0 is another thing. But I assume you overlooked this for the sake of the video, but it makes a dent in the proposition you’re making. As it cannot be zero, only approach. And thus it falls short describing light travelling at 0 time, when the limit never reaches 0.
It gets even weirder if you delve into the philosophy and history of the number zero, and all the ways that zero is different from other numbers.
This, depends on who you ask. It is not just an infinity, however. Since you can approach it from either end. So it could be a negative or positive infinity. Why is sometime is called an undefined infinity. But a lot of leave it as just undefined. But have also seen it be explained as a complex infinity. And computers just return it as an illegal operation, in most cases with an error message. But a computer can pretty much be set up to return any value you wish. (So there are calculators that will give you infinity)
One should be careful since 0/0 and 1/0 are not the same thing. 0/0 is generally treated as undefined. (Again, if we look how calculators handles this. The standard Microsoft calculator with Windows 10 (11.2210.0.0) will give 0/0 as undefined, while 1/0 as an illegal operation. Which I find rather funny.)
@@asdfdfggfd Yes, and another problem with the reasoning for infinite speed Astrum makes is that the distance is kept constant, length contraction also happens and therefore cannot be keept constant.
This is only true for mass, and light is massless. Light does not experience time. Light is generally understood to experience its entire life in an instant, ergo _it travels at infinite speed._
The model more or less agrees, in so many words. He's imagining speed as the hypotenuse h of a triangle where both x and y are strictly greater than zero. With x fixed, h approaches infinity disproportionately as y approaches infinity.
@astrumspace, I think there are a few crucial details you're getting slightly wrong, which I'd like to try to clear up. Length contraction isn't mentioned, but it's very important here
Take the example of traveling from Earth to Jupiter at the speed of light. Let's assume Earth and Jupiter are essentially at rest with respect to each other in an inertial reference frame, since their actual speeds are negligible compared to the speed of light (I believe you made this assumption as well). You're absolutely right that in your reference frame the journey takes 0 time, due to time dilation. But when you "tried to calculate your speed" (as you phrased it), you divided the distance between Earth and Jupiter as measured in the Earth-Jupiter reference frame by the time your journey takes as measured in your reference frame and concluded that "your speed" is infinite. When we talk about calculating "your speed", we can only talk about your speed in a particular reference frame. But what you calculated uses a distance in one frame and a time measurement in a different frame, which doesn't make much sense
So there are two natural inertial reference frames in which we can determine what "your speed" is--the Earth-Jupiter reference frame and your reference frame. (Of course, we can pick any inertial reference frame, but let's just look at these two). Obviously, in the Earth-Jupiter reference frame, your speed is the speed of light, since that was part of the problem definition. What about your speed in your reference frame? Well, in your own inertial reference frame, you're speed is zero by definition! "Your frame of reference" is the reference frame that describes events with you positioned at the spatial origin. But you might ask then, if in your reference frame your speed is zero and the journey from Earth to Jupiter takes 0 time, how does that make any sense? The answer is length contraction, which comes hand-in-hand with time dilation. In your frame of reference, the distance between Earth and Jupiter is 0. Indeed, all the objects in the universe that are traveling at low speeds with respect to the Earth-Jupiter frame are all squished into an infinitesimally thin plane perpendicular to their velocity in your frame of reference. And the speed of Earth and Jupiter in your frame is the speed of light, by the way.
Hope that makes some sense!
s=d/t -- ... But isn't it more accurately 0/0? Because of length contraction, if you are traveling at the speed of light, there is no distance to cover. As the Lorenz factor γ(v) gets closer to infinity, the observed length gets closer and closer to zero. It is reasonable to think for something going the speed of light, there is no distance to cover. So d/t becomes 0/0: speed is undefined. I suspect that: Emission and absorption become direct causal interactions. It's like the surface of the sun is directly touching the surface of Jupiter (or wherever.)
What gets me is if you are travelling the speed of light and shine a torch, the light from that torch still travels away from you at light speed, but instead of going twice the speed of light away from somebody that is stationary, that light is still only going the speed of light to them.
Something isn’t quite right about light that I can not quite fathom. My head hurts.
There is no resistance in space. Light is instant
According to this video, it's because both are on the same hyperbolic path. Thus, neither can travel any faster.
No, it doesn't and that's pretty much the thought experiment you see everywhere about the speed of light, although it's usually explained with cars and car lights. If the car is travelling at c, then you won't see it coming, you can't, because the lights also travel at that exactly same absolute speed limit and do not add up.
@@anthonyman8008 Light is definitely not instant. Every bit of light we see in the night sky took years or centuries, or more, to get to us. We aren't seeing the stars as they are now. Traveling at light speed would feel instantaneous to the person traveling, but not to anyone else observing.
It is a consequence of the laws of physics being the same no matter what speed you are moving at.
Love this 3 part series! I wish there is another episode on this series. I love hearing your theories and hypothesis. Keep up the good work 👍
I had seen another youtuber trying to explain this, but it was quite confusing. This is, by far, an explanation better suited for the rest of us. I thank you for that. Great video.
Yet again, as in all other explanations I've seen, there is a hidden variable introduced in the 4D concept - time. In our 3D space, any movement is possible because of something we perceive as "time" - without it, it makes no sense to talk about movement. In the 4D is described here in this video, time is described as another space dimension, and movement along this dimension is conceptualized. But then again, there has to be something as elusive as the 3D time, without which it would not be possible to talk neither about movement along the three space dimensions, nor along the "time" dimension. I believe this is an elephant in the room nobody seems too keen to be addressing.
"Relativistic mass is the mass of an object as measured by an observer in a different state of motion" > "concept of invariant mass"
2:35 The distance to Jupiter is zero if you're traveling towards it at c. To a photon the entire universe is thinner than paper in the direction it is moving.
Yes! And also backwards in time: all is "here and now" for the amazing photon.
That's really trippy. How would that look? I guess you'd have to sample this photon at a specific location in space for it to make sense.
Exactly. I wish the writers of Star Trek would internalize this fact! :)
@@TerranIV They did in Voyager when Tom Paris hit the warp 10 threshold, he subsequently devolved into an amphibian.
Maybe it would better to define c as the speed of time than that of light. Because if you move at the speed of c, no time can pass you.
c is the speed of time when at rest.
The TH-cam SpaceTime video "The Speed of Light is NOT About Light" shows that c is better called the speed of causality.
@@timjohnson979 I saw that video too, but I'm getting slow these days, only when I read your comment I remembered.
When you accelerate in 3d space you are simply changing direction. Your velocity through time is being traded for more velocity through space.
That makes no sense as speed is defined as the rate of change of distance with time.
Fun fact! I only ever go with the speed of me, and the universe around me bends to compensate for it. When i walk, the spacetime visibly shifts in the opposite direction, thus preserving physics.
Perspective is amazing once you begin walking it, right?
Fun fact: This is how 3D graphics engines for computer games work. Because distances are calculated in floating point numbers, which have the highest precision at the smallest scales. Instead of moving the camera through space, the space is moved around the camera, which always stays at the origin coordinates (0/0/0).
@@NeovanGoth most games actually don't do this. If it is a large open world game where floating point precision would be an issue then yes its probably implemented in some way or another. In versions of minecraft where the farlands exist this is actually very apparent, because movement in one direction becomes very choppy.
@@NeovanGoth which games do this?
@@uku4171 Basically all that use a rasterization pipeline afaik. Rasterization is all about transforming coordinates in world space into coordinates in screen space ("Where on my screen is that point?"), which requires two transformation steps. The first (often called "camera transformation") maps all points from world space into a coordinate system with the camera at its origin. The second one (the "projection transformation") then maps those points onto a 2D plane, which results in pixel coordinates on the screen.
To do this has a number ob advantages. As an example, it makes frustum culling very efficient, as one can start by simply throwing away all polygons behind the camera by filtering their points for negative z-coordinates in camera space.
Speed of light is not constant, it is faster near the center of the universe and slower on the outer edges of space. It is not a huge difference, but it is definitely different. This was proven a few years ago.
And light don't travel in a strange line. Also ALL readings are taken ON EARTH, Gods know how many things are interfering the light that arrive to Earth.
I am loving this series more than any recent box office movie. I wish I had all the money in the world to give to you so you can keep pursuing this! Keep it up
what about giving money to astrophysicists
For me a way to wrap my head around that universal speed limit is imagining a stone being dropped in the center of a lake being the light source, the particles within the generated wave being photons and their movement being time. at the top of a wave all particles almost stands still, arriving at the edge of the lake without ever being moved from their perspective.
That's a fascinating analogy. The first time I've been able to visualize the duality of photons, being particles that act like waves. Thank you!
Could you explain further? I'm curious about this analogy, but don't understand what you mean that the particles on the top of the wave feel as if they've never been moved. There's also an issue because in a wave very little of the water actaully moves sideways at all. It moves up and down as the wave moves through it, but it's mostly energy moving sideways towards the shore, not water.
@@erinm9445 It took me half an hour to verbalize my thought process, but i will try to explain further ;D at the top of a water wave particles are "carried". Put something atop a wave and it will stay there (if we are not talking about crashing waves). In my analogy photons are "carried" though time. On the other hand that would mean there are photons at the "bottom" of the wave that move rapidly (photons that experience time forward/backward rapidly) or never reach their destination (stay fixed in time). i have no idea if we would actually able to measure phenomena like this. maybe if we see more doppler redshift than expected? oh and dont forget we are thinking/imagining in 5 dimensional spacetime here ;D
Edit: Uuuh...could dark matter actually be photons fixed in spacetime and thats why they dont interact with anything going forward in time? I know it a bit long shot ;D
But the amplitude and wavelength changes with distance………?
@@cadfael4598 Well thats one of the many points this analogy breaks apart, since we live on a planet with an atmosphere and everything is in a thick goo compared to the interstellar medium ;)
i've always been told that since we're three-dimensional beings we can only perceive three dimensions of space, but the more i look into it, we definitely do witness four dimensions of space, albeit in a way you wouldn't first consider. if you want to see the fourth dimension, all you have to do is wait. we're always moving through the fourth dimension, but everything around us is too at the exact same speed, so it isn't apparent. but then that got me thinking even further, if light travels through only space and not time, what if you were to assume the inverse? moving through no space, and through time infinitely fast? now, the closest approximation of this would be in voids, not within the influence of galaxy clusters, but would you witness the entire universe receding away from you nearly infinitely fast? throw some cold water on this if need be, but what if this combined with the time dilation experienced in areas of high mass were the cause of what we call dark energy? just spitballing here, but i've been sitting on this idea for a bit.
It is possible to travel only through time, but infinite speed through time is not possible.
The speed limit through time is also C.
The symbol "c" represents the Speed of Causality. Hence why we use "C" and not "L" .
When an object is at rest, relative to your frame of reference, that object's speed through time is C.
If that object gains speed relative to you, it's speed through time start to decrease.
If that object were able to reach the speed of light, it's speed through time would be 0...just like a photon (of course, and infinite amount of energy would be required)
@@tylerdurden3722 that is a succinct way of describing general relativity as i understand it, yes. the operative word for my thinking is "nearly" infinitely fast [through time, NOT space], as stated in the next sentence.
This video perfectly illustrates why I studied geology and not physics 😵💫😆
Have you published a written article on this? You really should publish this information in a journal: even as just a theory, it sounds promising. Also, this may well be the journey our souls are able to travel as ethereal spirits after corporeal death, during occasions when we are not choosing or needing to inhabit light in order to make ourselves known to others.
"Inhabit light"??
This is pretty common physics, and has been theorized for over a hundred years.
Light doesn’t think it’s moving at light speed. However, the observer sees time dilation or the light isn’t moving. Light is a massless particle and d/t = s is invalid.
That is very interesting. It’s really cool hearing a theory that explains time dilation happens. You do a great job breaking down complex topics into understandable terms. Thanks!
This is not how time dilation happens, it's completely wrong. There is no mystery in time-dilation, and this hyperbolic nonsense is internally inconsistent, and also has nothing to do with relativity. This is a lie.
we already had a theory for why time dilation happens its called special relativity.
1:07 Fascinating, and this theory seems to explain some aspects of relativity, or at least be consistent with it. And it begins to explain what is meant by “space-time.” Your explanation makes me wonder if the theory may also explain the observation of the red-shift of galaxies at great distances, which has been the argument for a universe that is not only expanding, but accelerating. (If this was dealt with in one of the first two videos, pardon me. I have not yet seen them, but will.)
My question is, “are we observing red-shift because the universe is accelerating in its expansion, or because the universe’s space-time is curved, and the time dimension makes it look increasingly further away at greater distances in time as well as space?” I may not be explaining the idea well, but I suspect you get my point. Any comments, anyone?
@@markalbrecht6989 This "theory" is a form of fraud.
@@markalbrecht6989 Yeah, I asked myself the same question and gave myself the same answer...
The thing that boggles my mind is that zero photonic energy is lost after BILLIONS of years of travelling, to EVEN after trillions of years !!
apparently it does get lost if space expands, which it does in intergalactic space.
Also, how can it be massless? Is a photon even an entity of its own if it doesn't have mass, or is it just a wake in the electro-magnetic field and all its properties belongs to its surroundings?
@@ingvarhallstrom2306 bottom line there is no such thing as mass, only combinations of potential and kinetic energy with respect to the fundamental forces of nature.
even energy itself is not a physical thing, it's a mathematical model for describing how nature works.
I thank you for your explanations, I just can't wrap my head around it. Does not compute indeed....
@@ingvarhallstrom2306 “Is a photon even an entity of its own[...] or is it just a wake in the electromagnetic field” - Excellent question! Yes, the photon of the Standard Model _is_ the EM field. This is essentially why light can be expressed as a traveling EM wave-carrying exactly the photon's energy, inversely proportional to the wavelength up to the Planck constant (when in a vacuum).
“how can it be massless?” is also a very interesting question. I would better turn it around: how can anything be _massive?_ Stuff must get its mass somewhere in the first place... Our universe has a pretty high Higgs field vacuum expectation level, so some particles gain mass directly via the Higgs mechanism. Another way to become massive (in QFT/QCD) is confine energy in a volume. This is how the most of ordinary stuff-largely made of protons and neutrons, as electron mass is tiny in comparison-gain their mass. And free particles that don't interact by the Higgs mechanism have no rest mass in our best theory. Interestingly, only the photon may be solidly called in this category. Gluons are massless too, but always confined, and the SM does not explain the origin of mass of the neutrino. We know they have a tiny mass, indirectly, but there is not a clear-cut explanation for it. They are neither apparently confined, nor indeed gain mass by the Higgs mechanism.
Something that blew my mind about the speed of light, is the fact that it's actual speed, is "kinda an average". Nobody can measure it in only one direction. It's measured from it going to a point and coming back from that point. There's a veritasium video about this.
Ya, when you measure it’s always a round trip measurement, so is it taking 0 time to travel to point b and then 2 seconds back to point a? For a 2 second round trip, or is it 1 second there and 1 second back?
We literally have not devised a way to solve this issue.
You can’t even build a device to do this because the measurement device always needs a round trip, a capture device at point b does not solve the problem.
@@Trigger200284 what would be wrong with an emitter and a sensor, each connected to a computer with equidistant wires connecting the whole set-up? I would think the computer gets the signals from emitter and sensor of sending or receiving the light with the same delay between both, so we can figure out what the time between send and receive is
@@Trigger200284 All you need is very accurate atomic clocks at two locations that are in sync. At a given time a laser is fired over a long distance at a detector and the time is recorded when it hits the detector. The amount of the delay can be used to calculate the speed of light.
@@my3dviews Doesn't work. You just move the uncertainty to be a function of your ability to synchronize clocks over a long distance. Something that, practically speaking, you would probably do with light (eg: fiber optics).
@@TheAroVII Also doesn't work for a similar reason to My3dviews' idea - you've just shifted the problem to be a function of your ability to measure "equidistant" which again, practically speaking would likely be done with light (laser ranging or similar).
speed of light is the max speed, absolute zero is the min temp... it seems our world has boundaries... is the universe really infinite?
You've done a great job showing what has already been known through special and general relativity in a beautiful visual way. I'm pretty sure modern physicists aren't surprised by the concept of the universe's time dimension featuring hyperbolic geomerty because special relativity ACTUALLY uses the Minkowski model which is a hyperbolic geometry model.
Came here to say this. I appreciate the nicely produced video but maybe these guys should spend less time making TH-cam videos and more time cracking open like an intro GR textbook.
@@iguananaut - Some might say that the phrases "GR textbook" and "intro" are a contradiction in terms. Well, I jest of course, there are a dozen or more good intro books to General Relativity. In fact, at one point I spent many hours compiling a long list of GR books and trying to double-rank them in two orders: (a) best to worst in my rough estimate, and (b) order in which to read the best ones in terms of gentle/doable to tough-job-reading-it-due-to-the-math-involved. If I could only remember the file name ... If I find it, maybe I'll come back and post a select subset.
That being said, I do appreciate the effort made here by all involved, including video author and various discussers. Even if the approach taken in the video turns out to be a complete fail in the end, the process of trying to read/understand everyone's take on the raised issues does make you think, and that stimulus for thinking might end up in yourself (the reader/viewer) understanding a big subset of GR concepts whose road would not have been traveled by you, had the video and commenters not been there. So thanks to all.
A very interesting explanation! I am very curious if you could calculate the curvature of space based on this theory. I also wonder if perhaps this can explain dark energy since everything is moving forward in time that the hyperbolic space would cause new space to appear between objects.
Now that is using your noodle! How amazing it would be if reverse engineering the speed of light reveals the level of our universes curvature.
These videos are always so interesting
Another great video from Astrum!
Instead of infinite velocity, this video made me think a better term is "zero wait" travel. Photons essentially teleport, according to their own "clocks."
Photos do _not_ have clocks. The very concept of a clock requires change, but massless particles do not experience change. This is why we know that neutrinos must have mass: The can change between flavors (we can measure this), hence they must experience time, hence they must have mass. For a photon however, time has no meaning.
@@NeovanGoththat’s completely untrue. Time absolutely has a meaning for photons. You can’t just take an unphysical limit of relativity equations and weave a story about photons not experiencing time.
Here's a question that may seem nonsensical but it might be the right question. What if space doesn't require space? Like inside a black hole isn't infinite density but infinite space?
According to GTR, spacetime is flexible like a chewing gum. Chewing gum always requires chewing gum! And inside a black hole, spacetime density is not infinite. In physics, infinity means beyond our understanding & calculations!
i remember learning that light never accelerates to c, it simply goes from 0 to c. utterly blew my mind
It's never at 0
@@MrMischelito they’ve gotten it down into double digits I believe. Fascinating stuff.
Well why would it accelerate. It is not ramping up an energy output like an engine revving up, and it has nothing in its way to slow it down, nor any mass. It is just a singular packet of energy. Photons come from electrons. But only when an electron is forced into a high orbit, and since the electron wants to naturally fall back to its normal orbit, it does. But in doing so, it releases the excess energy as a photon. This is how all light is generated. Electrons are elementary particles like quarks, so they aren't divisible like protons and neutrons are (which are made of quarks), which means that energy has to become something, and so it becomes light.
The mind blowing thing is if we were ever to figure out a way to easily manipulate electrons and protons and neutrons, we would become masters of energy and matter, able to change or create any element, and able to create anti matter just as easily. Just these 3 basic things, if we could manipulate them with the wave of a wand or like a microwave you can just place some matter in and alter it. In many ways we already do exactly that, just not at the speed and volume and ease we would like. It would be the singular greatest discovery of humanity.
@@peoplez129 I think we are in early stages of what you’re describing. Alchemy at a subatomic level. Given enough time and resources we could have almost Godlike powers over reality. At least on a local scale. Science fiction has a way of becoming reality. Humans are truly amazing.
I didn't understand everything, but I enjoyed every bit of it. Especially using the correct units.
To be fair that is pretty fast. Light should be happy with that being it's limit
Until you realize that that it takes 4 years to get to the nearest star at that speed. Then you realize just how brutally slow the speed of light is.
@@jeremyglass4283 And 13.8 billion years to traverse the visible universe...
@@paulmichaelfreedman8334 I'm pretty sure that the bubble that we see now as the visible universe is around 90 billion light years across.
@@NiffirgkcaJ *93 billion ly
**Observable universe
@@user-jn7bq8wh1e that's what I typed.
I've been a huge admirer of your work. But you have outdone even yourself with this series.
The statement that from the photon's perspective, its speed is infinite is incorrect. That would indeed be the case if, in the photon's view, it were covering any actual physical distance in zero time. However, as the photon is moving through space at exactly light speed, from its own perspective, it remains stationary. In fact, even that would be a misnomer, as "stationary" implies being immobile in the midst of a stretch of space. To the photon, however, all space along its line of travel is contracted to zero, so there is no point of departure, nor of arrival. All it ever knows is the eternal here and the eternal now (in other words, it is a "fully illumined being" ☺).
An easy way to understand time dilation is by thinking of every interaction between particles as a tick on a clock. The fastest these particles can interact is at the speed of light, so if you are traveling near the speed of light then each particle will need to cover a greater distance in space to interact.
To you, time ticks at a seemingly normal rate because the interactions that mediate your existence still happen as fast as they possibly can. From someone else's perspective you stretch out because the particles in the back must cover great distances in space to catch up to the particles in the front.
Length-contraction.
You're the first person I've seen that understands it this way... this is the way I explain it for some time now... I don't know if its accurate or conform to the whole theory though but it seems to work and to be concrete... even if the maths are necessary if you want to do actual calculations. Interresting.
@@lovecontemplation8607 Space around you contracts because the particles that make you up interact over greater distances in space, so space will seem to contract from your perspective.
@@emmanueloverrated I saw it in a PBS Spacetime video
another fun thing to think about: photons travel at the speed of light. and as this video has reminded us, time stands still when you travel at the speed of light. so a photon experiences no time. in another word, from a photon's perspective, it's annihilated the very moment it's created. so, to us, photons exist. to a photon, it doesn't.
It’s transformed. Not destroyed. Energy cannot be destroyed
@@ritaandcharlescorley5668 The important part is that the moment it becomes a photon, it ceases being a photon.
I don't care if you are right or wrong just that you are attempting to make sense of it congratulations. Some great videos fo sho Keep diggin to the deepest depths of the universe.
You are always in motion, and the length of your motion vector never changes. All you can do, is change the direction of your motion within the 4D space-time environment. Your motion vector is identical to the motion vector of a photon of light. The only difference is that your direction of travel is NOT merely across space. And so if you create a simple geometric representation of your ongoing motion within Space-Time, a geometry which is composed of your motion vector and your length scalar combined, you can use it to derive the Special Relativity mathematical equations in mere minutes.
Why do we consider time as a direction? what if we don't have memory? would we still be able to capture time?
I really can't get my head around anything going the speed of light arrives anywhere instantly, that's just unfathomable to me
@SnoopyDoo Not to an external observer, but to the light it gets there instantly due to time dilation. It has to do with the frame of reference that you measure it from.
@SnoopyDoo To the thing travelling at that speed it does.
@SnoopyDoo Another reply already stated that it does, but nice try though.
@Polaris431It would not appear simultaneously at every point in the universe, or for that matter at any two points at all to an outside observer. Outside observers clocks would be running normally, the time only dialates for those traveling aboard the vessel going the speed of light. In other words, for example if you, the outside observer fixed a telescope on an object one light year away and someone else traveled to that object at the speed of light, from your perspective you would not see them arrive for one year, but to them they would get there instantaneously and would not age one year as you did.
as I understand it, this is because the distance contracts to zero from the perspective of the photon.
So basically, spacetime has a light limit.
Until we enter a black hole then it all gets weird lol
interesting! Did you also consider the possibility that particles can actually travel faster than that limit but those that do are not observable to us anymore cause they escape from our view.. and the limit is not the max light speed limit but the limit of velocity of particles that can still be observed? Just a thought 🤔
Tht made absolutely no logical sense at all u shoukd try agin
The Light of Wisdom and Understanding is a frequency we can all align with.
Min 3:00 the formula for measuring velocity of light is not length / time but rather Lorentz transformation of length / dilated time which is constant. An object who moves at the speed of light contracted the space and dilated the time.
I questioned the speed limit once quantum entanglement was proven to be real. Einstein described it as “spooky action at a distance” when changing the state of one particle caused the other particle to instantly change state, bypassing the SOL limitation. Either something was passed from one to the other, or they are one particle existing in 2 places.
They are one particle existing everywhere. According to the Copenhagen interpretation at least...
Actually as of today's interpretation it is "one" particle or better put the moment they get entagled the 2 function merged and turns into one wave function that collapses upon observation. However the speed of light or speed of information isn't broken here. Sure the wave function collapses when observer A makes the observation but B will not know or won't be notified either that A did the measurement unless A tells B - and that information/notification propagates with the speed of light.
Even though QM is non-local no classical information is exchanged faster than light. The speed of light limit still holds.
Ironically (and IMHO) that can only be explained by accounting for light's "proper time" (subjective time), which is, as explained in the video, infinitely fast. A photon is simultaneously everywhere in its trajectory and that's why "spooky action at a distance" happens, even going backwards in time (DCQE experiment), for the photon there's no past or future, only eternal, instantaneous, now.
Not even Einstein could understand that, so worry not, but it directly seems to derive from Einstein's Relativity that it must be, it is, thatway.
c is really just the propagation speed of quantum fields, though, (and a programming language, but thats not important right now), and quantum entanglement happens outside of this field.
Thanks for making this point a little easier to understand, I will share this video with people who just don't really get what I'm trying to say about light speed and that technically from the point of view of the traveler there isn't really a speed limit and you can essentially travel at almost any speed as seen by the traveler only
This has to be one of the most enlightening videos on TH-cam. Please make a follow up video! I felt like you were going too fast for me. I would love an even more detailed view of this hyperbolic nature of reality!
There is no hyperbolic nature of reality. It's his theory and it's invalid
The "Speed of Light" is not a speed and not a property of light. It is a conversion constant that compensates for measuring space and time with different units. C=100 cm/m if you measure distance in centimeters and time in meters. When we measure the speed of light, we merely discover the conversion constant between our space units and our time units.
⚠ Philosophical rant ahead
It is really intriguing the implications of this theory and how some concepts like entropy can be explained in this light!!
Here I mean entropy from a life experience point of view. Or how James Clear put it " It is the natural tendency of things to lose order. Left to its own devices, life will always become less structured. Sand castles get washed away. Weeds overtake gardens."
Imagine that this is caused by the true nature of space itself! On how things always and will ever do drift apart because space lines always drift apart, and we are constantly moving through space being teid to our planet, our solar system and our galaxy! Isn't that fascinating!
and what if we were able to some how counter that by - here me out on this - breaking free from moving through space!!!
I mean this might need for us to break free from our galaxy's gravitational pull, or actually our Supercluster gravtional pull!!
But only then, we might, achieve immortality!!! Only then we might be Gods! or meet God!
7:22
"You would need to push against something to change your time dimension"
In a sense something exist... antimatter. antimatter is seen as time reversed matter it means that it's behaviour is like matter was moving backward.
When you collide with antimatter if the same mass and particle its like you are colliding with something moving in your opposite direction, this can be seen then as being pushed into only the time dimension and become a photon or other massless particles.
It's like when you encounter an antimatter you, you collide in the time dimension and become massless with no time
Antimatter isn't backward in time, it has opposit spin and charge, basically it ls electrons are positive and its protons negative. If it was traveling back in time it should oppose gravity and all other forces.
@@davidgavranic5044 gravity doesn't repel things, in fact, antimatter attracts to massive objects in the same way, and was tested to do so years ago. And having an opposite charge and spin is exactly like being reflected against time axis so...
@@davidgavranic5044 it doesn't literally travel back in tim but it behaves like time reversed matter, in quantum mechanics.
What it does is essentially move in opposite direction of matter if it were in its same position, I thought to add this in my comment but didn't want to make it too long by doing so.
This isn't even an hypotesis it's just an observation that two things like a positron and an electron that behave in the opposite manner through time when collided release something that is massless (essentially without time) although if moving fast they can produce other particles with mass.
Its interesting how it looks like there is some kind of conservation of momentum through time and it might be linked with mass, mass being the reason time space and consequently speed exist
thank you for elaborating on antimatter. I was hoping someone would bring it up. physicists ponder why we don't see equal amounts of matter and antimatter in our universe. this video begins to explain that.
Great video and a great subject. You have forgotten to mention that the speed of light you have showed is in a vacuum. It will be different depending on the media the light is traveling through
That's a really good point - so does e.g. glass or famous caesium curve space time differently? I'm sure you could do the math and find some curve for every medium. That means: we need to propose an experiment that you can proof or disproof or else it's just playing with functions
Nope, the speed of light is _always_ the same. It just _appears_ to be slower in a medium because of interference.
Astrum: Why is light this specific Speed?
Light: Why is your video this specific resolution?
where do you get your phenomenal b-roll videos from? Stunning. Oh, yeah, you do numbers and stuff also - thats also not bad too.
These ideas apply LOCALLY, not globally. It's entirely possible there exist FTL manifolds where information can be transferred instantaneously, which would appear to occur before causation to a particular observer. i.e. time travel in the "reverse" direction. (Papers have been written on this."Back to the future" in Physical Review is one of many many FTL papers.)
Very interesting video. What is crazy is that the objects we observe in the universe, travels with different speeds, and thus different times. Gravity is also due to time difference close to massive objects I think.
This seems to make a lot of sense to me and it's very appealing. Like infinite speed still doesn't really make sense but neither does the speed of light to me but this makes it seem very clean and makes more sense than anything else. It reminds me of a Science Asylum video I watched once explaining how mass curves spacetime just by slowing time near mass and the differential between 2 points on an object near a mass traveling at a velocity curves the object toward the mass (i.e. gravity) as an inevitable consequence of the time dilation. If the speed of light makes sense, then the photon clock thought experiment that Science Asylum also has a video on that explains Special Relativity by looking at the velocity of the clock and the photon inside with the assumption that speed of light is constant to external observer also makes that seem very clean and inevitable. It's all very strange, but I like it because it seems consistent at least and any attempt I could make myself to understand these sorts of questions would lead to worse paradoxes if anything
I have often thought that if you did reach the speed of light, you would never be able to push the stop button because no matter where you are pointed or how far away it was, you would instantly be there... So, if you were pointed at some thing, you would hit it the exact moment you reach light speed. More interesting is if there was nothing in your way. You would basicly be in suspended animation forever. Here's another point about time dialation. The faster you travel, the more mass you gain. This would indicate to me that, at some point, you would become a black hole; likely well before you reached the speed of light. However, the more mass you gain, the more gravity you would have, the slower time would go for you, as well. You know, until you become a singularity. Maybe, all the black holes in the universe are alians who acheived close to light speed travel.
However unlikely it may be, it makes me wonder if achieving light speed travel could be the great filter
@@plaguex5z011 That's a stunningly interesting idea.
photon has no mass. So you can go as fast as you want, the photon will stay with no mass :D And as you would need energy to move an existing mass, the faster you move, the larger the amount of energy you need to even go faster and so on until the energy to reach speed of light become infinite. Also, the object you move will expand in length making the mass not crossing the point of singularity --> sorry but it indicates to me, you wouldn't become a black hole :D
There is no speed when you’re in the realms of “space time math”. Hu -mons have to come to grips with this fact, that Self existence isn’t bound by the absolute and it microscopic limits as you all perceived them. In one breath you fathom and could quantify a discovery and in the next breath, you develop this belief that your minds are too small to adopt an imbued awe, so unbelievably unbound and incommensurable, that you allow your self to digitize its vastness as the infinity. The problem is you’re counting in directions, time and space. The nature of your universe doesn’t require extreme focus. No wonder why your world hasn’t evolved into a type 1 civilization to say the least.
The human mind only needs a thought or an idea to be anywhere in the universe at will… and no invariant or Pettis integral based math could “shape” that reality. The spirit and or soul of man is what you ascribed as infinite, how then it is quantified? Seeing that you have foreknowledge that the absolute is incalculable.
If that is true in your minds, then reality shapes itself according to your limited beliefs, which means that God is therefore a man.
It's not a law of physics, they're more of... suggestions of physics.
Strong ones yes, but still just suggestions. Unwarp spacetime, warp spacetime more, ripple it. Lots of ways to do that.
And then there's the ""laws"" of thermodynamics, but really they're just the suggestions of thermodynamics. Creating energy isn't allowed is not a rule, it's a challenge.
Question then; If light is an oscillating electromagnetic wave, and light experiences no time. Then if it looked down at itself what does it see? oscillations require the existence of time.
@@doesnotcompute6078 According to relativity, if something happens it's true from all perspectives.
@@doesnotcompute6078 Yes but what you wrote didn't address the question and just side stepped it.
I just described it to someone else, as in the video. Time never actually stops for the photon. It becomes infinitely close to zero, but never actually reaches zero time. The limitations of math force us to round it to some "non infinite" value which is "almost" indistinguishable from zero. If we allow the photon to exist for long enough (billions. trillions of our years) then the wave propergation should begin to emerge and become measurable by our limited tools. (Opinion)
@Does Not Compute I disagree. Yes, everyone claims what cannot be proven to be true, but I disagree.
@@axle.australian.patriot That would make sense since it's not infinitely fast
Alex, I’d love to hear your thoughts on multiple big bangs (not just one big bang but serial “bangings”, if you will). I fancy the notion that we’re still thinking a bit too geocentrically and that we actually dwell within a wave or ripple being flung away from a much grander structure than we’ve been giving Momma Universe credit for the ability to comprise. In similar fashion to a CME wafting violently from the surface of a star, our observable universe could merely be a section of such a ripple, and one of many which expand concentrically, or at least in succession, from some ineffable surface (which I further like to imagine as being curved at the value immediately adjacent to zero degrees, y’know, just to bake the old noodle some more). To me, this makes dark energy merely the crowding and rebounding of big banging.. wave.. ripple.. layers.. (I’m truly undecided upon their nomenclature).. which, like ripples in a pond, travel outward, periodically pushing and periodically pushed, gliding steadily toward oblivion (or perhaps I mean evaporation). Anyway, I like to suppose the present acceleration we witness in the universe could simply be an indication that we’re in an aging ripple with a younger one directly at our heels. Okay. Thank you for hearing me out, if that be the case. Cheers! -Phill, Spokane
That's something I agree with, ie that the so-called "big bang" is actually one of many "small bangs". After all, how do we know what is big and small when it comes to bangs?
reminds me of cixin liu's three body problem. the idea that the speed of information is a direct byproduct of the geometry of reality is very interesting. in TBP, our three dimensional reality is actually a much reduced version of a ten dimensional perfect universe with near instantaneous causality. each time the spatial dimensions were lowered, the speed limit of existence lowered proportionally as a result.
the different constants of nature being expressions of a base geometry of reality has always been tantalising and interesting to me.
i would definitely be unsurprised if some variation on this idea turned out to be true, but was itself nested within higher geometries that gave rise to even the sort of fundamentality you describe. (i don't mean strings though. i find them a very contrived and uncompelling interpretation, even if the ideas themselves are beautiful and elegant. i definitely subscribe to the idea that their attractiveness has been a trap and a brain drain)
Sunlight reaches earth after 8 1/3 minutes covering 93 million miles, so speed of light is dwarf in comparison to our vast size universe
The way that I understand it, the speed of light is not an upper limit, but rather an asymptote.
Theoretically, the model doesn't prevent something moving faster than the speed of light. But nothing that does could slow down to lightspeed in the same way that nothing made of regular matter can reach light speed.
We need Sabine H in here.
Interesting theory but did you take into account, during your calculations, that light cannot escape a black hole? If the speed of light is variable in a vacuum and can exceed 300,000 km per second then we would be able to see black holes, not just their effects on other objects. Just a thought.....
IIRC light can't escape a black hole because the gravity curves space so extremely that every path a photon could take (and it will always take the shortest distance between 2 points) curves back into the black hole. I believe that light can technically escape if it is traveling exactly parallel to the 'poles' of the black hole, but the light itself is infinitely red shifted. Things also get more red shifted as they approach the event horizon. Even though light doesn't have rest mass, it is affected by gravity as it is affected by the curvature of space-time caused by that gravity.
I've heard another explanation that light can't escape because time stops past the event horizon and light needs time to move (even though from the photon's point of view, its travel time is instantaneous?), and the escape velocity past the event horizon is larger than the speed of light, which might be true but isn't the reason why light can't escape.
I have a theory that particles and photons .move faster then the speed of light after the event horizon
@@stephanie8560 basically they get sucked in and accelerate towards the center faster then light
intriguing idea :)
I wonder if one could calculate the "curvature angle/rate" of spacetime using the observed speed of light
One book I saw claimed that the curvature of space time near the Earth is about the radius of one lightyear.
This doesn't impact the overall hypothesis, but in the beginning something was oversimplified. x/0 is not infinity. It's undefined. lim x/y as y approaches 0 is infinity. Two different things. The word limit is used later, but should have been introduced in that early example.
"Ah, an interesting piece to watch and wind down after a long day"
A few moments later
"Aw, Gawd... It's... Hyperbolic..."
Because Einstein!
man these shows are just outta this world......and light years from reality
Good Head Food Alex.
Doesn't the Indeterminacy Principal apply to the measurement of C?
It would apply if you were attempting to measure the position AND speed of a particular photon. Either value can be measured to good accuracy if the other is sacrificed.
> the continuation of a model
Well thanks for not making it too easy on us and linking the videos in the description or anything.
This man just explained how the hyperbolic time chamber works. Damn.
“Time is the mercy of Eternity; without Time's swiftness/ Which is the swiftest of all things: all were eternal torment.”
-William Blake
Well I've always thought about C as the speed of time itself. In fact if you look at E=mc2, if you consider C as time then you can see why mass or energy dilates time.. It's because Time, Energy, and Mass are all equivalent and the true nature of the universe is that it wants to remain in balance. By increasing energy, either time or mass has to be reduce. By increasing mass, either energy or time has to be reduced. In both cases we see real world time dilation.
I think light is the data storage (hard drive) of the sim we live in. I made a video about this. I'm glad you're thinking about things outside the box. That's what we need more creativity.
So fun note, the person moving at high speeds ALSO won't calculate their speed as greater than the speed of light, because an oft overlooked facet of relativity is distance contraction- that is, the faster you go, the shorter you measure things within the vector of your velocity. Light would not perceive itself crossing infinite distance in zero seconds, but rather a very boring zero distance in zero seconds, which even I can do. It's only when we return to subrelativistic speeds that we believe we've travelled a greater distance, but also over a greater time, so in no perspective does it seem like we're breaking the speed limit
From the "light" perspective, the universe would be moving at the speed of light, and thus would appear to have flattened completely in the direction the light is traveling.
So from light's perspective, it is traveling at the speed of light. It just has 0 distance to cover.
It's also weird because from its perspective, it is destroyed as soon as it's created, regardless of how long it lives.
Mass might mess with spacetime. But not having mass messes with everything.
This proves the theory that I thought of a long time ago that causality itself has to be faster than the speed of light for the light itself even to propagate being supposedly the fastest thing in the universe.
C is constant velocity of light and gravitation is acceleration, both light and gravity are bosons. Both are non-local.
We don't need gobs of energy to increase our speed. Speed is relative. So we get to include the vector sum of all existing applicable speeds: Earth's rotation, Earth's orbital velocity, the speed at which our solar system moves through and with our galaxy, and so on. In fact, we can do this: just identify whatever object is moving away from us fastest; that speed is OUR speed relative to it. We get to call that our speed, same as if we once long ago accelerated from it to our current relative velocity.
My brain hurts. I don't understand most of this. I feel so close in understanding then...nothing. Replaying the segment repeats the experience.
I need a more dumbed down 'For Dummies' version.
>_
Maybe it is more simpler to consider that Time is the entity who give Space the 3-rd dimension.
And maybe speed of light is dependent by Universe's state if we consider that complexity or entropy is increasing and the "processing power" of the Universe is constant.
Dividing by zero is not infinity. It isn't defined.
I feel I must point out: Actually if you began suddenly traveling toward Jupiter at the Speed of light:
1 - You would perceive that zero time had passed.
This much is correct.
2 You would observe that you have traveled 679 million Km.
This part is false. Due to length contraction, you would actually observe that you had traveled zero kilometers.
A photon does not perceive that it is traveling infinitely fast. It perceives that everything in its direction of travel is right next to each other.
Now: Something I think you were hinting at and which is interesting is that, all the equations of special relativity that describe length contraction or time dilation contain some version of 1-(v^2/c^2) or in other words, they contain the Pythagorean theorem, with C being the length of the Hypotenuse, and time and distance forming the opposite and adjacent legs of the triangle.
After observing that in the math, I never could quite decide what to make of it. But I feel like you might have a chance of figuring out what it means.
If you have two points anywhere in the universe, the object that is traveling will never arrive at point B prior to leaving point A. If you have said object returning to point A, the same applies.
To be frank, calculators do not throw an error due to the answer being infinity if you attempt division by zero. Zero is a null value, which basically means it has 'no' value, it is simply nothing. Trying to divide any number by nothing is obviously (one would think) impossible, so an error is thrown.
The real bugger about x/0 being infinite is that it also extends to negative infinity. This is why it is considered undefined, because you don't know which you will get.
Alex McColgan deserves governmental funding for his excellent videos. Way better than most things produced by public broadcasting, I feel privileged to get to watch these videos for free.