also would like to complement alan alda for doing his physics homework and einstein homework well enough to have a discussion with brian that bridges the gap between lay and expert.
@@rodrigolara6263 Alan Alda is valuable because he is the average person who is interested but doesn't want to take the 'course' Physicist can often be full of themselves. Alda & the physicist Brian Greene are terrific. For me physics is the opportunity to understand the 'mind of God"
9:58 Brian: "... Jump out a window, and then gravity goes away." Alan Alda: "What? You jump out the window, gravity makes a quick entrance." hardest I've laughed all day.
@@DeathBringer769 he is right what goes away is WEIGHT u still have mass,as mass is the amount of substance present in you and gravity is still pulling u down.
A Higgs boson goes into a church, a priest stops it at the door and says they don't allow Higgs bosons in church, the boson replies, if I'm not here, how do you expect to have mass?
I love science, it is art, it is imagination, it is specific, intellectual, considered, controversial, creative, psycholically impacted by the researchers and possibly the assessors. It opens up many possibilities and chaos. What a stimulating endless field.
if God exists, he cannot be a scientist. That is absurd. Science starts by the recognition that we cannot have direct knowledge of the natural world, so we formulate a hypothesis about it, we test it and if it shows right we ask someone else to come to the same conclusion independently, if not, we discard it. Then we continue building on the hypothesis proven right, to build an understanding that could be demolished at any point if someone finds a condition where one of the previous conclusions fails to comply with the theory, and back to the drawing board. If God exists, he should be the original designer with direct knowledge of the natural world. He would have the same use for science than an Olympic runner would have to a baby's walker.
@@tb14.7 this demonstration supported nothing, but it perfectly showed the main idea of general relativity. The free faling bottle with holes in it and water inside had the same "expirience" as the same bottle in a space whithout gravitional field. These are two invariant reference frames, and existence of those reference frames is the main idea behind general reletivity.
@@tb14.7 It completely supported it. If you are falling, you are moving freely along the curve of gravity, so you don't feel gravity. When we feel gravity we are really feeling our resistance against it. When you're in freefall, there is no resistance except maybe wind resistance. But essentially, when fully experiencing gravity, you don't feel gravity. In the vacuum of space, there is no gravity, but for people on the space station there is. The reason they float is because they're in orbit, which is just freefall. They're falling along the curve of gravity, so they don't feel it. Just like when you're in freefall on earth.
You’re wrong. He introduced the cosmological constant in his field equations for uses with cosmology. When you look at positive values for the constant in the Newtonian Limit, you get an expanding universe. He called it his biggest blunder because he was convinced, and MANY many other people, that the universe was static. It turns out he was wrong. We have multiple pieces of evidence for this, including the recession of a supernova.
@@Godakuri the point is that the cosmological constant is still used today, because there IS an underlying force that is actually pushing our universe outwards. So, even though the constant was implemented because of a blunder, it actually proved to be the correct implementation.
@@argosron9838 that came from a mistake in his calculations of tensor calculus though didn't it? Friedmann used Einstein's own field equations to prove that the universe can expand or contract
When Kaku started embracing the idea of the alien mega structure around that distant star as an explanation for its varying brightness, I knew it was time to stop taking him seriously.
@nineball26 swinging something around like the elevator is acceleration and the system at play which is isolated inside the elevator does attract masses...you don't know what you're talking about
Einstein took the simple observation that light had a fixed speed ...and like pulling a thread on a sweater, unraveled all of these other equations and revelations. But Einstein viewed things as concrete and could never accept the uncertainty of quantum mechanics.
I see +Max GT is a classic determinist/proponent of determinism, lol. Einstein would be happy since he didn't think the universe played dice either, even though he also came up with many things (he tried to throw out) that ended up being true that directly went against what he wanted to universe to behave like, lol. There's an old saying in Physics that goes "even when Einstein's wrong, he's usually still right" lol. Even the stuff he thought he wrong that he came up with often ended up being used later and shown to have some truth or insight there ;)
@@tb14.7 He demonstrated the necessary. Other factors? Sure but the water doesn't feel the force of gravity. That's what he was out there to demonstrate.
Brian Greene, he is the best at explaining (Classic physic,Quantum theory,String theory,.....)Science in general.I think one day he will surprise us with something new, we all need to understand. ( Greene joined the physics faculty of Cornell University in 1990, and was appointed to a full professorship in 1995. The following year, he joined the staff of Columbia University as a full professor. At Columbia, Greene is co-director of the university's Institute for Strings, Cosmology, and Astroparticle Physics (ISCAP), and is leading a research program applying superstring theory to cosmological questions. He is also one of the FQXi large grant awardees, his project title being "Arrow of Time in the Quantum Universe". His co-investigators are David Albert and Maulik Parikh.)....
A photon checks into a hotel when the bellhop asks, "Would you like help with your luggage?" The photon replies, "I don't have any. I always travel light."
Enjoy listening to that great conversation. Love physics. Brian Greene and Alan Alda are both great communicators for science. Have been following Brian Greene from the 90s greatly enjoying his book The Elegant Universe as well as his other books, appearances on science panels which I watch often on TH-cam, CSPAN, PBS specials and whatever else. He is very good at conveying physics and making it clear and understandable. Love listening to him.
I love Alan Alda's science shows. He's funny and asks the questions people like myself, who are interested but don't know much, want to get answers for!
The title should be, "Einstein's Happiest Thought: If a person falls freely, he cannot feel his own weight!" Turn to 9:00 for this thought, a demonstration of it using water, and some comments on the role it plays in Einstein's general theory of relativity. Turn to Kip S. Thorne's book Black Holes and Time Warps: Einstein's Outrageous Legacy chapter 2, for a good telling of the way this happiest thought came to Einstein in 1907 and how it bloomed into a theory of curved space-time eight years later.
But i can't see the connection between curved space time and what he just explained, that gravity is the ground pushing against us. In the theory of curved space time, how i get it, gravity goes towards the biggest mass because it bends space and everything lighter than this mass falls in this direction where the biggest mass is, so we do fall in direction of the center of earth? But then why is there no gravity if we actually fall? Why does earth push against us? Because it's moving? Or rotating?
Gravity is a pseudo-force. You only *feel* what we call gravity if you are in an accelerated frame of reference, like we are here on Earth. Your natural free-fall is hindered by Earth pushing up against you. Einsteins happiest thought was that free falling/acceleration does away with gravity as a force; it cannot be felt or measured while falling. One way of visualising the equivalence between gravity and acceleration is to imagine a light beam entering a hole on the side of an accelerating elevator. The light bends according to a curve. If gravity and acceleration are equivalent, gravity must bend light in the same way.
Frankly, I think Einstein was right. Once we have a grand unified theory, I think the seemingly randomness of quantum mechanics will be shown its not pure chance & probability & Einstein will be proven right. String theory or/and M theory might be the answer. Higher dimensions might explain entanglement.
I also think this. The story on quantum mechanics is not true. The Pilot Wave Theory shows that you can get exactly quantum mechanical motion from macro objects. Why don't we formulate a theory that follows the structure of the Pilot Wave Theory? Because it goes against the chaotic narrative of our times. But we could easily posit a model that creates the same observations of the double slit experiment through concise and totally explainable underlying phenomenon. I'm working on this very thing. All it is, is waves upon waves. That's what creates this seemingly "random" phenomenon.
Well if Quantum mechanics' probability can be eliminated by grand unified theorg then the physics ( classical mechanics and maxwell eqn ) will also go into trash . So you can't really overide QM *now* that it has given us many splendid results
@@shaunakmarathe86 A theory doesn't "go into the trash" when its limitations are discovered. For example, Einstein's theory of gravity superseded Newton's but calculations based on Newton's theory are still accurate enough to enable us to send probes to the moon and to other planets.
@@rclrd1 I meant that the previously established fundamentals will go into trash ( Uncertainty and all which is near impossible to disprove ). I just meant that sometimes u can't find the exact answer .
@Heisenberg-SchrodingerEmc2 I saw you everywhere on things about Einstein vs Bohr, or Einstein against QM. Lol. I am quite interested, mind if you tell me personally and taught what you know about it?
I feel privileged to be here listening to Brian Greene and laughing at his sarcasm like anyone else present there with him in the room... I feel privileged that I am among those curious people who understands such complex things
I hope to attend one of Brian greens world science festivals one day .Alan alda was or is a very underrated actor. I actually was working on a script at one time with him in mind in the leading role.
You don't see round earth deniers or conspiracy theorist about the earth or universe on these type videos, it's too much information for them to comprehend.
Either that or youtube doesn't recommend/suggest these videos to them. If they searched for things that could disprove their theories then youtube would give them some great suggestions. Especially now that people are putting almost everything on youtube.
why the hell are you bringing this topic here?? don't you know that almost all the famous conspiracy theories are now being proved true ? or are you also one of the idiots who consider themselves scientific yet don't there is life outside earth. wow, you are ruining this talk with your nonsense comment, grow a fucking brain before you talk yourself completely stupid
Relativity describes the relationship between the force and the observer . . . a great deal of this discussion is pretty confounded. Gravity is simply an expression of momentum, albeit on a planetary (or cosmic) scale, and indeed the two forces (gravity and momentum) behave in an almost identical manner. Greene seems to rush through the most pivotal portion of Einsteins discovery. When Einstein envisioned a man trapped inside of an elevator, one that was caught in free-fall down its shaft, the man inside that elevator observes an actual weightlessness as real as any scale could possibly register him in that moment (without the force of gravity acting upon his body at all.) That was actually the apex of his theory, not the man simply jumping out the window. We, observing outside of the falling elevator, know that the force of gravity is working equally upon the man as it is on the environment around him, making the negation of the force of gravity relative to his personal observation. It is the same for an object caught in orbit around a cosmic body: The "weightlessness" an object experiences in space is actually micro-gravity, not "anti-gravity". That micro-gravity is a point of free-fall that holds its own momentum equally in tandem with that of the Earth, skirting just around the very edge of the dent the Earth's mass affects onto space/time. That relativity is the same with the water bottle: Gravity did not go away inside the bottle when it was dropped, but the force of gravity was working equally on the water molecules inside it as it was on the bottle itself. Only the observation was that of "anti-gravity". It does not matter if the observable point - and in that case the water - contains no conscious sensory organs to observe the negated effects (such as proprioception or visual orientation;) There is still a physical point which can be observed. What seems to be missed in this discussion is the objective mass of an observer (or point of observation,) and the most vital ramification of a scale registering an equal amount of applied gravitational force when the elevator is lifted, adding momentum to the already existing force generated by the Earth itself. Quantum Mechanics never negated the empirical reality of General Relativity, and I cannot understand why Einstein couldn't see that - as Greene suggests here. I've only studied Einstein's work, not his personal life. What he actually nailed exactly was the reality of the physical universe, of gross matter, which we also know he described as being composed of energetic constituents (of course though E=MC^2.) It is those energetic constituents that defy observation, which is why pure energy particles must be considered in terms of a wave and their location deduced with uncertainty. But quantum phenomenon, such as entanglement, may very well adhere to a certain type of relativity that simply defies our current understanding of existence, being unobservable (except perhaps in their effects.) And I would bet every dime that I have, or ever will have, against there being found a "graviton" or any quantum particle to equate the force of gravity.
Gravity is clearly an emergent force as per #Verlinde . It's becoming more and more clear that what Einstein said, that Quantum Mechanics is "incomplete," is undoubtedly correct. .
Well the truth is that isn't really high level quantum physics, it's just 1% of 1% of the field. Quantum Physics is full of crazy math, understanding that IS hard.
Generally, I like Brian Greene, he knows his stuff but his commentary is a bit confused. Einstein's problem was indeed with non-locality, (*not* with determinism, or entanglement), entanglement just implies some correlation, not causation, and Einstein rejected non-local hidden variable theories, like David Bohm's. His position was that determinism and hidden variables would follow as a consequence of the principle or locality. Of course, we now know Einstein was wrong, not because of any experimental confirmation of entanglement (much less spooky-action-at-a-distance) but because of Bell's inequality theorem. I think it would be more accurate to say Einstein hated the Copenhagen interpretation, rather than quantum mechanics, as-a-whole. Unfortunately, those two are used interchangeably.
I'm an Einstein fan have read several biographys and have university degree in Physics. I can tell you that, imho, Einstein hated indeterminism and hit upon non-locality as a way to demonstrate that QM was incomplete and that a complete theory would be deterministic. So it was quite the other way round from what you say. Why else would he say "God does not play dice with the universe!?"
It came as a great annoyance to people like John Bell when anyone had accused Einstein of being wedded to strictly to determinism. The EPR argument doesnt presuppose determinism and Bell's theorem does not disprove determinism. It's just not in the argument. Here's what Pauli said to Born in a letter in 1952 _". . . I was unable to recognize Einstein whenever you talked about him in either your letter or your manuscript. It seemed to me as if you had erected some dununy Einstein for yourself, which you then knocked down with great pomp. In particular Einstein does not consider the concept of "determinism" to be as fundamental as it is frequently held to be (as he told me emphatically many times) ... he disputes that he uses as a criterion for the admissibility of a theory the question : "Is it rigorously deterministic?"..-he was not at all annoyed with you, but only said you were a person who will not listen"._ Here's what Bell said _"It is remarkably difficult to get this point across, that determinism is not a presupposition of the analysis. There is a widespread and erroneous conviction that for Einstein determinism was always the sacred principle. The quotability of his famous "God does not play dice" has not helped in this respect"_
Andrew Wells Ok good. However, that is hearsay evidence - things that other, albeit reputable, people say was Einstein's outlook. Are there any writings or quotes by/of the man himself to corroborate?
Ya well your boy got OWNED by bohr at Copenhagen. and he's gonna get owned again once dark matter is discarded! then we'll see who the real gangsta is.
I don't think Einstein was wrong about the quantum mechanics. I think what Einstein was trying to figure out was a theory that is able to describe the motion of subatomic particles when they were not interfered by human observation. Once observed, the particles are already interfered by human being's observation. Quantum mechanics best describes the subatomic world only because it can explain the result of experiments, which are all human intervention. In my humble opinion, quantum mechanics works but still a superficial theory. A deep, fundamental theory should be just one theory that explains all.
@@patriksjokvist6431 Hey Bohr, don't you mean measurement...not observation?! 'I said Observation! And that's what I Meant!' It's been known for decades that that explanation doesn't cover the empirical 'observations'. That's why we Still have the Measurement Problem.
@@aaroncurtis8545 Regardless of language, previous commenter is right. A conscious measurement or not does not need to be present to cause interference in a quantum system. If two systems interact at all, there is interference. Period. A human scientist making a measurement is just one type of interaction.
The man in free fall is 100 percent experiencing gravity. It's the force rocketing him toward the ground . Just because the scale is also rocketing toward the ground, and he is no longer experiencing gravity RELATIVE to the scale, does not mean he's not experiencing gravity at all. Think Brian could have done a much better job of explaining how this served as a gateway into general relativity for Einstein. Hell, I'm not sure he ever even used the word relativity after initially bringing it up.
What they are trying to say is that in free fall, your body does not feel any force pushing you, other than air molecules rushing by and hitting your body.
Nice, this video finally made me understand how gravity really isn't a force of attraction but, as Einstein proposed it, a warping of space time which creates an accelerating field.
13:05 Einstein reduced gravity to motion. Now we just have to reduce electromagnetism to motion and we have a theory of everything. Walter Russell has done this already and it is worth investigating.
In the water experiment, Greene said gravity goes away. But it doesn't. The water that poured out of the holes is still being pulled down by gravity, just not out of holes. Am I the only one noticing it, or am I missing something?
@jesusbermudez6775 i just watched it again and still don't see how someone cannot understand that all the water - not just that coming out of the holes - was acted on by gravity. It's an extremely simple and wrong example trying to explain a complex thought. But maybe it's me.
He did. He is actually known as the father of QM. He especially did a lot of Quantum statics and all other kinds of stuff. He just didn't like the Copenhagen interpertation.
Keshen Govender I think the sad part is all the time he wasted trying to unify the forces. If he had spent all that time excepting the forces could not be unified and working with those forces to develop and understand them the whole world could be ahead further. That said at least once Einstein could not unify the forces at least it stopped any one else bothering to try to do so. So I guess its as long as it is short.
@@roland20002000 No. In fact, the reason why a Unified Field Theory is impossible, at present, is because QM and Relativity are incompatible on a fundamental level. Given how much time, money and effort has been made to correct this problem, it is concievable at this stage that one of them is probably wrong.
Greene explains Einsteins equivalence of gravity field and accelerated frame of reference but should have taken it to next level explaining the affect of light traveling in that gravity field and how it provided the insight that gravity is the consequence of the variations of the geometry of space-time (where mass-energy tells us the geometry).
Science and religion work similarly - both try to give an idea that explains everything (before creation + creation + the end). Science uses logic & equations, while religion uses faith & philosophy to come to their respective theories/conclusions. Unfortunately, the universe is so vast and random that none can completely understand/explain even a tiny percentage of it.
I truly agree with Brian green, you have to find deep pattern in the nature to understand how universe works in broader spectrum, & exactly that is what I did.
+MaDrung It's easy to say than done, first of all I'm committed to all human kind not just one government. I have to be in neutral country before I will do that make sure no government with any means try to interfere with me and the knowledge I will put out there.
Dear Brian, with due respect -Gravity goes away - when Water stopped spewing from holes..NO.. gravity was still very much there without any change..When bottle was still...gravity pulled water..when bottle was dropped gravity pulled the bottle and water both at same force (resulting same speed)..as a result water followed the bottle ..still going down . If gravity would have gone away than water should have been coming out top of the bottle.. Gravity was always doing it's job ..very honestly !! I always admire you dear Brian -you being a excellent Guru for me and will always be.
Maybe gravity is so weak because it extends through the dimensions... we don't really know how to do it yet. Maybe after confirming the gravity force (we have detected gravity waves so far) with gravitons we can find the best path for explaining the force better.
Quantum mechanics are applied to the atomic and subatomic world. Relativity handles the larger scale physical processes. Gravity is a property of space. Objects are not attracted to each other, they interact with the gravitational field according to their mass.
@@wallacegrommet9343 but then why they even form gravitational field ? Why is it that the force applied by them on another mass is always attractive ? (Unlike electrostatic force)
@@darkseid856 In principle because that's how space-time works, at least in this universe, all matter bends the space-time where it's located, in an uniformly way from it's center of gravity, expanding outwards decaying on intensity of the gravitational 'force' infinitely
Very important comment by Brian Greene in the last paragraph of this video: "Einstein didn't use acceleration in his formulas for special relativity"! Many people forget that, even physicists when they try to explain time dilation and other special relativity effects. There are only relative speeds and different observer positions, but never acceleration. That is why special relativity only talk about energy increase of objects close to c, not mass increase as many also get wrong.
I've had so-called quantum physicists explain different facets of that science and contradict themselves within three sentences. They were quite secure in their explanations. Do not, under any circumstance allow a quantum mechanic to repair your car.
That's a terrible description. It's not that gravity no longer exists. It's just that the bottle and the water are both experiencing gravity's force, so they would both fall at the same rate if it weren't for air resistance.
Starting to wonder what if the uncertainty in quantum physics is somehow tied to our consciousness. What if our thought/choice itself is the hidden variable upon which all these mysterious phenomenon are taking place?
Yes, exactly. That's kind of a rephrasing of the measurement problem. Bohr kind of thought what you said... I think. Trying to figure out what Bohr thought is like trying figure out quantum mechanics, 😄
Maybe someone can answer a question about the video experiment. Situation 1: Brain holds the bottle. Water is accelerated out at 9.81m / s. Situation 2: Brain drops the bottle. And water comes to a standstill. Water come to 0m / s Situation 3: Brain throws the bottle in the air? Now my question: Then water should come out faster for a short period of time? 9.81M + speed up?
The story is a lesson to us all. If Einstein with a mind that could transcend his senses and act counterintuitively and then get caught up in his own 'mental settings' refusing to budge, he allowed his feelings to dictate his mind, something he didn't do before. Minds need to be cleaned. :) Maybe parallel universes and the many world theory made quantum physics necessary. And it eliminated determinism & starting pt for manifestation and ultimate creation. Alan Alda is hold his own. He and Morgan Freeman should create a new series on physics.
Time also appears in this business of acceleration, or energy levels and motion. However, there is one concept missing: infinite complexity. Why? it's not math.
Greene is a theoretical physicist and professor at Columbia. He has written several books popularizing concepts in the field, particularly string theory. His father, Alan Greene, was a vaudeville performer, and that influence is evident in Brian's flamboyant personality and the water jar demonstration. Brian Greene also studied piano with concert pianist, Jack Gibbons. In my day, physics profs were not this entertaining.
In quantum mechanics the physical system is described through a wave function whose evolution over time is determined by the Schrodinger equation. The wave function represents infinite different possible results for the physical quantities related to the system, but when we take a measurement, only one of these infinite possibilities becomes real; after the measurement, we must therefore modify the wave function “by hand” to eliminate all other possible results, and this modification is called the “collapse” of the wave function. The fundamental problem with quantum mechanics is that interactions among particles are already included in the Schrodinger equation and such equation does not predict any collapse. The collapse of the wave function is a violation of the Schrodinger equation, i.e. a violation of the most fundamental laws of physics and therefore the cause of the collapse cannot be determined by the same laws of physics, in particular, it cannot be determined by the interactions already included in the Schrodinger equation. The Schrodinger equation is what allows us to make quantitative predictions about the outcomes of future measurements; everytime we make a measurement, we receive new information about the system, and we need to "update" our wave function, i.e. to collapse it, otherwise the Schrodinger equation would provides wrong predictions relative to successive measurements. After one century of debates, the problem of measurement in quantum mechanics is still open and still represents the crucial problem for all interpretations of quantum mechanics. In fact, on the one hand it represents a violation of the Schrodinger equation, that is, a violation of the fundamental laws of physics. On the other hand, it is necessary for the laws of quantum physics to make sense, and to be applied in the interpretation and prediction of the phenomena we observe. This is the inescapable contradiction against which, all attempts to reconcile quantum physics with realism, break. Quantum mechanics is incompatible with realism (that's why Einstein never accepted quantum mechanics); all alleged attempts to reconcile quantum mechanics with realism are flawed. Quantum mechanics implies that physical reality (the universe) consists of the collection of all observed phenomena and such phenomena do not exist independently of consciousness. In fact, the properties of a physical system are determined only after the collapse of the wave function; when the properties of the system are not yet determined, the system is not real, but only an idea, a hypothesis. Only when collapse occurs do properties become real because they take on a definite value. It makes no sense to assume that the system exists but its properties are indeterminate, because properties are an intrinsic aspect of the system itself. The collapse represents the transition from a hypothetical system to an actual system. The collapse of the wave function represents a non-physical event, since it violates the fundamental laws of physics, and can be associated with the only non-physical event we know of, consciousness. Therefore, the only consistent rational explanation of the collapse is that it occurs because consciousness is involved in the process. However, the fact that properties are created when a conscious mind observes the system in no way implies that it is the observer or his mind that creates those properties and causes the collapse; I regard this hypothesis as totally unreasonable (by the way, the universe is supposed to have existed even before the existence of humans). The point is that there must be a correlation between the collapse of the wave function (=violation of the physical laws) and the interaction with a non-physical agent (the human mind); however, correlation does not mean causation because the concomitance of two events does not imply a causal link. The consciousness that causes the collapse of the wave function must be an eternal consciousness, that is, a conscious God. This is the idealistic perspective, which implies that physical reality exists as a concept in the mind of God who directly creates the phenomena we observe, according to the matematical models through which He conceived the universe (the laws of physics); the collapse of the wave function is a representation of the moment when God creates the observed phenomenon. This is essentially the view of the Irish philosopher George Berkeley, and in this view God is not only the Creator, but also the Sustainer of the universe. Idealism provides the only logically consistent interpretation of quantum mechanics, but most physicists do not accept idealism because it contradicts their personal beliefs, so they prefer an objectively wrong interpretation that gives them the illusion that quantum mechanics is compatible with realism.
When he unscrewed the cap, the pressure of the air is what is pushing the water through the holes in the container. When he drops the container the the water is dropping with the same amount of force it would take the air-pressure to push the water out. If you had enough distance and you could accelerate the container fast enough, the air-pressure pushing on the holes would push the water up and out of the container.
The water experiment was a great demonstration, but a poor experiment. The water sprays out from the holes because the water above is exerting pressure (gravity) on the water below as it pushes it out, where it then continues to get pulled down by gravity. When he dropped the bottle, ALL of the water is now in gravity's grasp and freefalling where it is no longer pushing down on the water below. So the pressure ceased, as did said jets of water spraying from the holes. Again, great demonstration, as exhibited by 5 years of comments taking note of it, but that doesn't make it an accurate depiction of what's actually taking place.
@@themcserdwar yes it depicts accurately. Because it proves that the water does not feel any pressure as its free fall is its natural, undisturbed existence. Natural existence is not described as being motionless, it is described as being in motion exactly as curved space determines it. And we live in a curved space because of gravity.
@@Surmoka When you free fall from a plane you may live in what you perceive to be a pressure free, natural undisturbed existence, save for those pesky air particles smacking you in the face on the way down. But then you encounter the earth, which also smacks you in the face, though quite a bit harder than those air particles. We might not fully comprehend gravity, but we certainly live with it, and it doesn't go away when someone performs a neat party trick.
@@themcserdwar exactly, you are in a natural existence until you crash into Earth, if we ignore air resistance. Because, from your perspective, Earth just rushed up to you and hit you in the face. And this perspective is just as valid as the one from where you look like falling. This is not a neat party trick, it is a fundamental aspect to understand relativity. And yes, we comprehend it, it i works. And it's the one that works, proven experimentally countless times.
Zero gravity=weightlessness. Freefall=weightlessness. Hence, freely falling objects do not experience gravity at all. It follows that it is not physically correct to say that objects are in a state freefall if and only if they are pulled by the force of gravity since they cancelled out the force of gravity to begin with.
When Dr. Greene said “(Dr. Einstein) was tied to a philosophical perspective of the reality”, was is just me? or Was there anyone who think he was made a joke. “Strings Theorists” have been both Philosophically and Psychologically tied to that theory, which they knew decades ago that it’s not real. Einstein didn’t hate or regret about Quantum Mechanics. He was smart enough to realize that it was Easier, Closer and Better to disprove than to prove. Well, It’s a very low probability, but to be on my safe-side; Even if it was real, it could not be proven/proved (Stupid Grammar) .... Unless they can prove ‘there are 24+ dimensions’ + ‘all waves and particles are basically come from vibrations’ + ‘Quantum Fluctuations is real and our bubbly universe didn’t need any temperature or pressure to form’. M-theorists are tied to their perspectives, they spent billions of $$$ to build useless tunnels and Star-War-liked Laser Toys. So, Dr. Greene might be joking about that, or he might be one of those tied-up Physicists.
Yes, but no. String theories is basically another einstein version of simplified theory of universe. And particle accelerator built to study quantum physics, not satisfying anybody lust.
Dear Publisher, Please make following corrections: at 14:30, acceleration does not bring "Gravity" into "existence", Gravity was still there, acceleration makes it perceptible, i.e. it brings "Gravitation" into our perception.
Yes you could say that but it's all the same. The moment the objects start falling, FOR THEM gravity does not exist any more. For you it does, because you see the objects fall. But as we know, all motion is relative and your truth, being an outside observer, is no stronger than the bottle's truth that experiences weightlessness and its surroundings accelerating upwards.
Loved the analogy of the elvator speeding up in free space. But 8f thats the case , why does earth stops "rushing" towards you when you are above it in space ? By this theory , even if your are in outer space above the earth , the earth shoukd rush towards you ? Right ? Anyone ?
@jesusbermudez6775 Got notification for such an old comment from TH-cam on your reply! Great to know you found it informative. Ignore my naive comment, I was bit younger then 😅
also would like to complement alan alda for doing his physics homework and einstein homework well enough to have a discussion with brian that bridges the gap between lay and expert.
yeah me too! but i still think that the conversation could have gone better...alan seems lost at times,in my opinion
drop expert from Brian's title and your good. nobody is an expert in metaphysics, this is not physics, this is a discussion about what physics means.
@@rodrigolara6263 He is almost 80 there, give him a break. I liked his method.
@@ronik24 yea...you are right, perhaps i was too harsh on him
@@rodrigolara6263 Alan Alda is valuable because he is the average
person who is interested but doesn't want to take the 'course'
Physicist can often be full of themselves. Alda & the
physicist Brian Greene are terrific.
For me physics is the opportunity to understand the
'mind of God"
9:58 Brian: "... Jump out a window, and then gravity goes away."
Alan Alda: "What? You jump out the window, gravity makes a quick entrance." hardest I've laughed all day.
Shows you the difference in perspective between a Physicist and a layman, lol. Words can mean completely different things.
That was Hawkeye making an entrance. LOL
The difference between a Physicist and a Comedian. Comedians live in the relative world of their own perspective.
@@DeathBringer769 he is right what goes away is WEIGHT u still have mass,as mass is the amount of substance present in you and gravity is still pulling u down.
@John Digsby well weight is nothing but mass×acceleration due to gravity so yes you need gravity to measure weight
A particle walked into a bar.... and it didn't
Heisenberg's uncertainty principle, nice
Zecariah Aden Nah, it was that damned cat Schroedinger brought.
eatenbytheweasel Sounds like the Uncertainty principle of electrons
A Higgs boson goes into a church, a priest stops it at the door and says they don't allow Higgs bosons in church, the boson replies, if I'm not here, how do you expect to have mass?
robbiewit69 LOL!
I love science, it is art, it is imagination, it is specific, intellectual, considered, controversial, creative, psycholically impacted by the researchers and possibly the assessors. It opens up many possibilities and chaos. What a stimulating endless field.
In other words, you have no idea what science is.
+Galactic President Superstar McAwesomeville does anyone?
denise brooks yet it's so limited by limited minds true science is in The Great scientist -Göd-
if God exists, he cannot be a scientist. That is absurd.
Science starts by the recognition that we cannot have direct knowledge of the natural world, so we formulate a hypothesis about it, we test it and if it shows right we ask someone else to come to the same conclusion independently, if not, we discard it. Then we continue building on the hypothesis proven right, to build an understanding that could be demolished at any point if someone finds a condition where one of the previous conclusions fails to comply with the theory, and back to the drawing board.
If God exists, he should be the original designer with direct knowledge of the natural world. He would have the same use for science than an Olympic runner would have to a baby's walker.
Make me a sandwich first
This is how science should be, the impossible comment followed by clear as a bell demonstration - terrific
🛎
@@tb14.7 this demonstration supported nothing, but it perfectly showed the main idea of general relativity. The free faling bottle with holes in it and water inside had the same "expirience" as the same bottle in a space whithout gravitional field. These are two invariant reference frames, and existence of those reference frames is the main idea behind general reletivity.
@@tb14.7 It completely supported it. If you are falling, you are moving freely along the curve of gravity, so you don't feel gravity. When we feel gravity we are really feeling our resistance against it. When you're in freefall, there is no resistance except maybe wind resistance. But essentially, when fully experiencing gravity, you don't feel gravity. In the vacuum of space, there is no gravity, but for people on the space station there is. The reason they float is because they're in orbit, which is just freefall. They're falling along the curve of gravity, so they don't feel it. Just like when you're in freefall on earth.
The world Needs more professors like Brian Green 😌👏👏👏👌👌👌
It's always worth bearing in mind that usually, whenever we think that Einstein was wrong about something, it turns out he was right all along.
Wrong, he was thinking this universe is static, observation proved him wrong, this universe is expanding exponentially.
You’re wrong. He introduced the cosmological constant in his field equations for uses with cosmology. When you look at positive values for the constant in the Newtonian Limit, you get an expanding universe. He called it his biggest blunder because he was convinced, and MANY many other people, that the universe was static. It turns out he was wrong. We have multiple pieces of evidence for this, including the recession of a supernova.
@@Godakuri the point is that the cosmological constant is still used today, because there IS an underlying force that is actually pushing our universe outwards. So, even though the constant was implemented because of a blunder, it actually proved to be the correct implementation.
Not about quantum mechanics though
@@argosron9838 that came from a mistake in his calculations of tensor calculus though didn't it? Friedmann used Einstein's own field equations to prove that the universe can expand or contract
can we just acknowledge those 2 catches :)
ikr
Nopeee dopeee
Ookkkkk dokkk
@@RuhulAmin-bg5st poo in the loo
Darn he explained things better than professor michio kaku....damn this explanation was worthwhile..15 minutes well spent
Michio Kaku is highly overrated, according to my physics prof.
When Kaku started embracing the idea of the alien mega structure around that distant star as an explanation for its varying brightness, I knew it was time to stop taking him seriously.
@nineball26 swinging something around like the elevator is acceleration and the system at play which is isolated inside the elevator does attract masses...you don't know what you're talking about
@nineball26 why you don't know what you are talking about?
I'm sure Brian is making so many people smart with his explanations.
Einstein took the simple observation that light had a fixed speed ...and like pulling a thread on a sweater, unraveled all of these other equations and revelations. But Einstein viewed things as concrete and could never accept the uncertainty of quantum mechanics.
But still theorized the confirmed Bose-Einsten Condensation we make at the labs today.
we dont serve faster than light traveling particles ....said the bartender .
a tachyon walks into a bar
I see +Max GT is a classic determinist/proponent of determinism, lol. Einstein would be happy since he didn't think the universe played dice either, even though he also came up with many things (he tried to throw out) that ended up being true that directly went against what he wanted to universe to behave like, lol. There's an old saying in Physics that goes "even when Einstein's wrong, he's usually still right" lol. Even the stuff he thought he wrong that he came up with often ended up being used later and shown to have some truth or insight there ;)
+Joe Shmoe
Didn't Einstein ignore all evidence pointing toward the Expanding Universe Theory because he didn't want to believe it?
Max GT im agreed with you
What a wonderful chat.
love to see an actor not only good at acting, but has enough knowledge to talk about Einstein with a physicist
Well said.
Bro, stop screaming Stella at the top of your lungs all the time
great video. I feel like I'm discovering Mr. Alda for the first time even though I've known who he is for about 40 years. what a cool guy to listen to
Brian is so great at explaining concepts, it's great to listen to him
spooky = spukhaft
Einstein called it "spukhafte Fernwirkung" = spooky remote/distance-effect"
That sounds like what you yell when you just dropped something heavy on your toe before you can manage a proper curse.
Meep Changeling What is with freaking you guys against German
+matyourin people speaking German to me also kinda feels like spooky distance-effect.
This convo XD
Spooky= Geistliche?
i could never imagine an old man this cool,..
11:28 is no one gonna appreciate Brian's catching damn
I like Brian Greene because he explains things in a simple manner. My favorite book of his is The Fabric of The Cosmos.
Spukhafte Fernwirkung
I like the reaction "What?!!?
you jump out of window, gravity makes a quick entrance!".
BRIAN GREENE IS ONE OF THE BEST.
NOT TOO MANY UNDERSTAND QUANTUM MECHANIC LIKE HIM.
THANK YOU
@@tb14.7 He demonstrated the necessary. Other factors? Sure but the water doesn't feel the force of gravity. That's what he was out there to demonstrate.
There is many others who know their stuff as good as him, but he can explain these things to us dummies so good.
Brian Greene, he is the best at explaining (Classic physic,Quantum theory,String theory,.....)Science in general.I think one day he will surprise us with something new, we all need to understand.
( Greene joined the physics faculty of Cornell University in 1990, and was appointed to a full professorship in 1995. The following year, he joined the staff of Columbia University as a full professor. At Columbia, Greene is co-director of the university's Institute for Strings, Cosmology, and Astroparticle Physics (ISCAP), and is leading a research program applying superstring theory to cosmological questions. He is also one of the FQXi large grant awardees, his project title being "Arrow of Time in the Quantum Universe". His co-investigators are David Albert and Maulik Parikh.)....
My new favorite explanation of General Relativity. Thanks, Dr. Greene.
A photon checks into a hotel when the bellhop asks, "Would you like help with your luggage?"
The photon replies, "I don't have any. I always travel light."
@@vairavanrenganathan4752 lol
Well this sucks
Sad no one get it haha. It's a funny joke yet.
Two hydrogen atoms are talking one day. One says to the other, "I think I lost an electron". The other says "Are you sure?". "I'm positive".
Two more intelligent and gracious people I have never seen having a public discussion.
Enjoy listening to that great conversation. Love physics. Brian Greene and Alan Alda are both great communicators for science. Have been following Brian Greene from the 90s greatly enjoying his book The Elegant Universe as well as his other books, appearances on science panels which I watch often on TH-cam, CSPAN, PBS specials and whatever else. He is very good at conveying physics and making it clear and understandable. Love listening to him.
I love Alan Alda's science shows. He's funny and asks the questions people like myself, who are interested but don't know much, want to get answers for!
The title should be, "Einstein's Happiest Thought: If a person falls freely, he cannot feel his own weight!" Turn to 9:00 for this thought, a demonstration of it using water, and some comments on the role it plays in Einstein's general theory of relativity. Turn to Kip S. Thorne's book Black Holes and Time Warps: Einstein's Outrageous Legacy chapter 2, for a good telling of the way this happiest thought came to Einstein in 1907 and how it bloomed into a theory of curved space-time eight years later.
But i can't see the connection between curved space time and what he just explained, that gravity is the ground pushing against us. In the theory of curved space time, how i get it, gravity goes towards the biggest mass because it bends space and everything lighter than this mass falls in this direction where the biggest mass is, so we do fall in direction of the center of earth? But then why is there no gravity if we actually fall? Why does earth push against us? Because it's moving? Or rotating?
Gravity is a pseudo-force. You only *feel* what we call gravity if you are in an accelerated frame of reference, like we are here on Earth. Your natural free-fall is hindered by Earth pushing up against you. Einsteins happiest thought was that free falling/acceleration does away with gravity as a force; it cannot be felt or measured while falling.
One way of visualising the equivalence between gravity and acceleration is to imagine a light beam entering a hole on the side of an accelerating elevator. The light bends according to a curve. If gravity and acceleration are equivalent, gravity must bend light in the same way.
Here are two people I never thought I would see together. So heartwarming
@David Mudry what does your comment have to do with what I said. Gonna report for spam
Alan Alda is brilliant. Great comic timing, and he obviously knows his stuff about physics. Great way to make it interesting and comprehensible.
He continues to demonstrate that he doesn't understand it!
Frankly, I think Einstein was right. Once we have a grand unified theory, I think the seemingly randomness of quantum mechanics will be shown its not pure chance & probability & Einstein will be proven right. String theory or/and M theory might be the answer. Higher dimensions might explain entanglement.
I also think this. The story on quantum mechanics is not true. The Pilot Wave Theory shows that you can get exactly quantum mechanical motion from macro objects. Why don't we formulate a theory that follows the structure of the Pilot Wave Theory? Because it goes against the chaotic narrative of our times. But we could easily posit a model that creates the same observations of the double slit experiment through concise and totally explainable underlying phenomenon. I'm working on this very thing. All it is, is waves upon waves. That's what creates this seemingly "random" phenomenon.
Well if Quantum mechanics' probability can be eliminated by grand unified theorg then the physics ( classical mechanics and maxwell eqn ) will also go into trash . So you can't really overide QM *now* that it has given us many splendid results
@@shaunakmarathe86 A theory doesn't "go into the trash" when its limitations are discovered. For example, Einstein's theory of gravity superseded Newton's but calculations based on Newton's theory are still accurate enough to enable us to send probes to the moon and to other planets.
@@rclrd1 I meant that the previously established fundamentals will go into trash ( Uncertainty and all which is near impossible to disprove ). I just meant that sometimes u can't find the exact answer .
@Heisenberg-SchrodingerEmc2 I saw you everywhere on things about Einstein vs Bohr, or Einstein against QM. Lol. I am quite interested, mind if you tell me personally and taught what you know about it?
Einstein said "If you can't explain it simply, you don't understand it well enough", Only a few can explain Quantum physics as Brian did.
I feel privileged to be here listening to Brian Greene and laughing at his sarcasm like anyone else present there with him in the room...
I feel privileged that I am among those curious people who understands such complex things
I loved this conversation and the older gentleman was just a delight haha
I hope to attend one of Brian greens world science festivals one day .Alan alda was or is a very underrated actor. I actually was working on a script at one time with him in mind in the leading role.
Brian Greene always speaks so well. He's got the gift of gab!
You don't see round earth deniers or conspiracy theorist about the earth or universe on these type videos, it's too much information for them to comprehend.
Either that or youtube doesn't recommend/suggest these videos to them. If they searched for things that could disprove their theories then youtube would give them some great suggestions. Especially now that people are putting almost everything on youtube.
why the hell are you bringing this topic here?? don't you know that almost all the famous conspiracy theories are now being proved true ? or are you also one of the idiots who consider themselves scientific yet don't there is life outside earth. wow, you are ruining this talk with your nonsense comment, grow a fucking brain before you talk yourself completely stupid
@@kt_drul a good laugh, we all know that's a good enough excuse for them to lie. Trump is from Jupiter, bet you didn't even know that.
EpicBunty “almost all the famous conspiracy theories are now being proved true” lmfao great one bro you had me good
Investigate 311
Relativity describes the relationship between the force and the observer . . . a great deal of this discussion is pretty confounded. Gravity is simply an expression of momentum, albeit on a planetary (or cosmic) scale, and indeed the two forces (gravity and momentum) behave in an almost identical manner.
Greene seems to rush through the most pivotal portion of Einsteins discovery. When Einstein envisioned a man trapped inside of an elevator, one that was caught in free-fall down its shaft, the man inside that elevator observes an actual weightlessness as real as any scale could possibly register him in that moment (without the force of gravity acting upon his body at all.) That was actually the apex of his theory, not the man simply jumping out the window. We, observing outside of the falling elevator, know that the force of gravity is working equally upon the man as it is on the environment around him, making the negation of the force of gravity relative to his personal observation.
It is the same for an object caught in orbit around a cosmic body: The "weightlessness" an object experiences in space is actually micro-gravity, not "anti-gravity". That micro-gravity is a point of free-fall that holds its own momentum equally in tandem with that of the Earth, skirting just around the very edge of the dent the Earth's mass affects onto space/time. That relativity is the same with the water bottle: Gravity did not go away inside the bottle when it was dropped, but the force of gravity was working equally on the water molecules inside it as it was on the bottle itself. Only the observation was that of "anti-gravity". It does not matter if the observable point - and in that case the water - contains no conscious sensory organs to observe the negated effects (such as proprioception or visual orientation;) There is still a physical point which can be observed. What seems to be missed in this discussion is the objective mass of an observer (or point of observation,) and the most vital ramification of a scale registering an equal amount of applied gravitational force when the elevator is lifted, adding momentum to the already existing force generated by the Earth itself.
Quantum Mechanics never negated the empirical reality of General Relativity, and I cannot understand why Einstein couldn't see that - as Greene suggests here. I've only studied Einstein's work, not his personal life. What he actually nailed exactly was the reality of the physical universe, of gross matter, which we also know he described as being composed of energetic constituents (of course though E=MC^2.) It is those energetic constituents that defy observation, which is why pure energy particles must be considered in terms of a wave and their location deduced with uncertainty. But quantum phenomenon, such as entanglement, may very well adhere to a certain type of relativity that simply defies our current understanding of existence, being unobservable (except perhaps in their effects.) And I would bet every dime that I have, or ever will have, against there being found a "graviton" or any quantum particle to equate the force of gravity.
Gravity is clearly an emergent force as per #Verlinde . It's becoming more and more clear that what Einstein said, that Quantum Mechanics is "incomplete," is undoubtedly correct.
.
What happens before an after a black hole hits a white hole ?
@@AdamStanway1248163264128 An Oreo Cookie ??
@@docfisher948 but then we would require 2 black holes .
I love listening to Brian Greene, he explains things in such a clear way, even a layman (like me) can understand quantum physics at a high level.
Well the truth is that isn't really high level quantum physics, it's just 1% of 1% of the field. Quantum Physics is full of crazy math, understanding that IS hard.
Every now and then i return to this beautiful conversation
For those who ask: the video starts at 0:00 and ends at 15:14
That's true if you are at rest. In motion, or in acceleration, the values change.
The video ends duration is only true if you're about twice the distance from sun to earth and move at the speed of about
3 x 10^8 m/s
Einstein, my number 1 teach who taught me about everything that exist through general relativity.
Generally, I like Brian Greene, he knows his stuff but his commentary is a bit confused. Einstein's problem was indeed with non-locality, (*not* with determinism, or entanglement), entanglement just implies some correlation, not causation, and Einstein rejected non-local hidden variable theories, like David Bohm's. His position was that determinism and hidden variables would follow as a consequence of the principle or locality. Of course, we now know Einstein was wrong, not because of any experimental confirmation of entanglement (much less spooky-action-at-a-distance) but because of Bell's inequality theorem.
I think it would be more accurate to say Einstein hated the Copenhagen interpretation, rather than quantum mechanics, as-a-whole. Unfortunately, those two are used interchangeably.
I'm an Einstein fan have read several biographys and have university degree in Physics. I can tell you that, imho, Einstein hated indeterminism and hit upon non-locality as a way to demonstrate that QM was incomplete and that a complete theory would be deterministic. So it was quite the other way round from what you say. Why else would he say "God does not play dice with the universe!?"
It came as a great annoyance to people like John Bell when anyone had accused Einstein of being wedded to strictly to determinism. The EPR argument doesnt presuppose determinism and Bell's theorem does not disprove determinism. It's just not in the argument.
Here's what Pauli said to Born in a letter in 1952 _". . . I was unable to recognize Einstein whenever you talked about him in either your letter or your manuscript. It seemed to me as if you had erected some dununy Einstein for yourself, which you then knocked down with great pomp. In particular Einstein does not consider the concept of "determinism" to be as fundamental as it is frequently held to be (as he told me emphatically many times) ... he disputes that he uses as a criterion for the admissibility of a theory the question : "Is it rigorously deterministic?"..-he was not at all annoyed with you, but only said you were a person who will not listen"._
Here's what Bell said _"It is remarkably difficult to get this point across, that determinism is not a presupposition of the analysis. There is a widespread and erroneous conviction that for Einstein determinism was always the sacred principle. The quotability of his famous "God does not play dice" has not helped in this respect"_
Andrew Wells Ok good. However, that is hearsay evidence - things that other, albeit reputable, people say was Einstein's outlook. Are there any writings or quotes by/of the man himself to corroborate?
I think it's better than hearsay but, just read the original EPR paper.
Ya well your boy got OWNED by bohr at Copenhagen. and he's gonna get owned again once dark matter is discarded! then we'll see who the real gangsta is.
I love this stuff so much.... when I was younger I didn't have much interest but now I find this very intriguing
Yes me too liked more girls than physics
Seriously? We have 41 people NOT LINKING this video? What has happened to this world?
Many people are still in denial of quantum theory. Taking science as a religion with separatism and dogmatic beliefs. With their Einstein God.
Why do you have the need for other people to like same things as you do? Cant you just enjoy the clip?
Kunal Mehta most people are idiots
11:35 I love how puzzled Alda looks at the wet floor, for a solid five seconds 😂
I don't think Einstein was wrong about the quantum mechanics. I think what Einstein was trying to figure out was a theory that is able to describe the motion of subatomic particles when they were not interfered by human observation. Once observed, the particles are already interfered by human being's observation. Quantum mechanics best describes the subatomic world only because it can explain the result of experiments, which are all human intervention. In my humble opinion, quantum mechanics works but still a superficial theory. A deep, fundamental theory should be just one theory that explains all.
An 'observation' in quantum mechanics is just an interaction between systems, it has nothing to do with a conscious observer.
@@patriksjokvist6431 Hey Bohr, don't you mean measurement...not observation?! 'I said Observation! And that's what I Meant!' It's been known for decades that that explanation doesn't cover the empirical 'observations'. That's why we Still have the Measurement Problem.
@@aaroncurtis8545 Regardless of language, previous commenter is right. A conscious measurement or not does not need to be present to cause interference in a quantum system. If two systems interact at all, there is interference. Period. A human scientist making a measurement is just one type of interaction.
Thank you Brian, Thank you Allen, that was beautiful, peace and love, Doug.
The man in free fall is 100 percent experiencing gravity. It's the force rocketing him toward the ground . Just because the scale is also rocketing toward the ground, and he is no longer experiencing gravity RELATIVE to the scale, does not mean he's not experiencing gravity at all.
Think Brian could have done a much better job of explaining how this served as a gateway into general relativity for Einstein. Hell, I'm not sure he ever even used the word relativity after initially bringing it up.
What he is doing is kind of using a metaphor to get the concept across.
The guy falling no longer feels gravity.
What they are trying to say is that in free fall, your body does not feel any force pushing you, other than air molecules rushing by and hitting your body.
Nice, this video finally made me understand how gravity really isn't a force of attraction but, as Einstein proposed it, a warping of space time which creates an accelerating field.
A particle walks into a bar ... through two different doors ... waving.
...waving... until they watch him, then collapses!
😂🤣😂😂
@@radiowallofsound that's it xD
13:05 Einstein reduced gravity to motion. Now we just have to reduce electromagnetism to motion and we have a theory of everything. Walter Russell has done this already and it is worth investigating.
I'm looking for Alan Alda stuff because I love him as an actor, not a scientist. You guys are way too smart for me, I feel belittled xD
+Metalmanmick13 HAHA Stop a Douchbag?
change places with heat and motion. Interesting relationships starts to be revealed.
Alan Alda!
Great simplified explanation and discussion :)
gravity and motion have the same effect on angular momentum
play with that and you will win
No. Gravity and acceleration do.
In the water experiment, Greene said gravity goes away. But it doesn't. The water that poured out of the holes is still being pulled down by gravity, just not out of holes. Am I the only one noticing it, or am I missing something?
@jesusbermudez6775 i just watched it again and still don't see how someone cannot understand that all the water - not just that coming out of the holes - was acted on by gravity. It's an extremely simple and wrong example trying to explain a complex thought. But maybe it's me.
Imagine if Einstein embraced Quantum Mechanics i wonder if he would have been able to unify the forces then.
He did. He is actually known as the father of QM. He especially did a lot of Quantum statics and all other kinds of stuff. He just didn't like the Copenhagen interpertation.
Probably.
he tried to unify QM for a long time. He and many other top scientist at the time. they were'nt succesful
Keshen Govender
I think the sad part is all the time he wasted trying to unify the forces. If he had spent all that time excepting the forces could not be unified and working with those forces to develop and understand them the whole world could be ahead further. That said at least once Einstein could not unify the forces at least it stopped any one else bothering to try to do so. So I guess its as long as it is short.
@@roland20002000 No. In fact, the reason why a Unified Field Theory is impossible, at present, is because QM and Relativity are incompatible on a fundamental level. Given how much time, money and effort has been made to correct this problem, it is concievable at this stage that one of them is probably wrong.
Who else misses Scientific American Frontiers with Alan Alda?
Such a fantastic show.
These guys are good. I already knew all that science, but I did not know it could be presented that well.
Greene explains Einsteins equivalence of gravity field and accelerated frame of reference but should have taken it to next level explaining the affect of light traveling in that gravity field and how it provided the insight that gravity is the consequence of the variations of the geometry of space-time (where mass-energy tells us the geometry).
What's the Spooky word in German is stupid question!
Every word in German is spooky :P
Ja...Ja!
German, the most ugly language to exist.
Forexalised in your opinion
Did Einstein not say it in English anyway, he was bilingual and escaped to USA...
Science and religion work similarly - both try to give an idea that explains everything (before creation + creation + the end). Science uses logic & equations, while religion uses faith & philosophy to come to their respective theories/conclusions. Unfortunately, the universe is so vast and random that none can completely understand/explain even a tiny percentage of it.
alda reminds me of a cross between ralph nader and carl sagen.. 'thats a compliment of major proportions'..
General Relativity: G(F/m)(H/m) = 7.426157905 x 10^-28 m/Kg. Special Relativity: (F/m)(H/m)c^2 = 1.
I truly agree with Brian green, you have to find deep pattern in the nature to understand how universe works in broader spectrum, & exactly that is what I did.
Then write some papers and get them peer reviewed instead of posting videos on the youtube.
+MaDrung It's easy to say than done, first of all I'm committed to all human kind not just one government. I have to be in neutral country before I will do that make sure no government with any means try to interfere with me and the knowledge I will put out there.
Levon Guyumjian i think you're just batshit insane and are too incomplete to write papers. I can speak because I actually am writing papers lol
Alan Alda has one of the beutiful voices in cinematic history i know of. He is truly inn the likes of Swaggersoul
"Imagination is more important than knowledge" because imagination GETS YOU TO KNOWLEDGE.
Dear Brian, with due respect -Gravity goes away - when Water stopped spewing from holes..NO.. gravity was still very much there without any change..When bottle was still...gravity pulled water..when bottle was dropped gravity pulled the bottle and water both at same force (resulting same speed)..as a result water followed the bottle ..still going down . If gravity would have gone away than water should have been coming out top of the bottle.. Gravity was always doing it's job ..very honestly !! I always admire you dear Brian -you being a excellent Guru for me and will always be.
Yet we still dont have a distinct quantum theory for gravity.
Maybe gravity is so weak because it extends through the dimensions... we don't really know how to do it yet. Maybe after confirming the gravity force (we have detected gravity waves so far) with gravitons we can find the best path for explaining the force better.
what about those trampoline experiments though
Quantum mechanics are applied to the atomic and subatomic world. Relativity handles the larger scale physical processes. Gravity is a property of space. Objects are not attracted to each other, they interact with the gravitational field according to their mass.
@@wallacegrommet9343 but then why they even form gravitational field ? Why is it that the force applied by them on another mass is always attractive ? (Unlike electrostatic force)
@@darkseid856 In principle because that's how space-time works, at least in this universe, all matter bends the space-time where it's located, in an uniformly way from it's center of gravity, expanding outwards decaying on intensity of the gravitational 'force' infinitely
Very important comment by Brian Greene in the last paragraph of this video: "Einstein didn't use acceleration in his formulas for special relativity"! Many people forget that, even physicists when they try to explain time dilation and other special relativity effects. There are only relative speeds and different observer positions, but never acceleration. That is why special relativity only talk about energy increase of objects close to c, not mass increase as many also get wrong.
Brian Greene is awesome!
I've had so-called quantum physicists explain different facets of that science and contradict themselves within three sentences. They were quite secure in their explanations. Do not, under any circumstance allow a quantum mechanic to repair your car.
The water experiment was invented by Isaac Newton :)
That's a terrible description. It's not that gravity no longer exists. It's just that the bottle and the water are both experiencing gravity's force, so they would both fall at the same rate if it weren't for air resistance.
Starting to wonder what if the uncertainty in quantum physics is somehow tied to our consciousness. What if our thought/choice itself is the hidden variable upon which all these mysterious phenomenon are taking place?
Yes, exactly. That's kind of a rephrasing of the measurement problem. Bohr kind of thought what you said... I think. Trying to figure out what Bohr thought is like trying figure out quantum mechanics, 😄
uncertainity principle arises from mathematics of fourier tramsforms even without any connection to physical world.
Maybe someone can answer a question about the video experiment.
Situation 1: Brain holds the bottle. Water is accelerated out at 9.81m / s.
Situation 2: Brain drops the bottle. And water comes to a standstill. Water come to 0m / s
Situation 3:
Brain throws the bottle in the air?
Now my question: Then water should come out faster for a short period of time? 9.81M + speed up?
Alda's voice doe
What he has a lovely voice. Yes like a cartoon character but lovely
+Michael Sleight I agree, it's fantastic.
The story is a lesson to us all. If Einstein with a mind that could transcend
his senses and act counterintuitively and then get caught up in his own
'mental settings' refusing to budge, he allowed his feelings to dictate
his mind, something he didn't do before. Minds need to be cleaned. :)
Maybe parallel universes and the many world theory made quantum
physics necessary. And it eliminated determinism & starting pt for
manifestation and ultimate creation.
Alan Alda is hold his own. He and Morgan Freeman should create
a new series on physics.
Summary of Einstein's opinion on quantum mechanics:
"Gott würfelt nicht." - "God doesn't roll dice."
Niels Bohr: "Don't tell God what to do."
It's actually stop telling God what to do but yeah
And the dice are loaded
That reminds me of strict Christians. They are not allowed to play games using dice or playing cards because those can be used in gambling.
"'Probably' is the language of quantum mechanics." A clear demonstration that Alan Alda gets what he's talking about.
That look 14:00 😂😂😂
Time also appears in this business of acceleration, or energy levels and motion. However, there is one concept missing: infinite complexity. Why? it's not math.
That water bottle tipping over at the beginning bothered me for the rest of the video
Greene is a theoretical physicist and professor at Columbia. He has written several books popularizing concepts in the field, particularly string theory. His father, Alan Greene, was a vaudeville performer, and that influence is evident in Brian's flamboyant personality and the water jar demonstration. Brian Greene also studied piano with concert pianist, Jack Gibbons. In my day, physics profs were not this entertaining.
In quantum mechanics the physical system is described through a wave function whose evolution over time is determined by the Schrodinger equation. The wave function represents infinite different possible results for the physical quantities related to the system, but when we take a measurement, only one of these infinite possibilities becomes real; after the measurement, we must therefore modify the wave function “by hand” to eliminate all other possible results, and this modification is called the “collapse” of the wave function.
The fundamental problem with quantum mechanics is that interactions among particles are already included in the Schrodinger equation and such equation does not predict any collapse. The collapse of the wave function is a violation of the Schrodinger equation, i.e. a violation of the most fundamental laws of physics and therefore the cause of the collapse cannot be determined by the same laws of physics, in particular, it cannot be determined by the interactions already included in the Schrodinger equation. The Schrodinger equation is what allows us to make quantitative predictions about the outcomes of future measurements; everytime we make a measurement, we receive new information about the system, and we need to "update" our wave function, i.e. to collapse it, otherwise the Schrodinger equation would provides wrong predictions relative to successive measurements. After one century of debates, the problem of measurement in quantum mechanics is still open and still represents the crucial problem for all interpretations of quantum mechanics. In fact, on the one hand it represents a violation of the Schrodinger equation, that is, a violation of the fundamental laws of physics. On the other hand, it is necessary for the laws of quantum physics to make sense, and to be applied in the interpretation and prediction of the phenomena we observe. This is the inescapable contradiction against which, all attempts to reconcile quantum physics with realism, break.
Quantum mechanics is incompatible with realism (that's why Einstein never accepted quantum mechanics); all alleged attempts to reconcile quantum mechanics with realism are flawed. Quantum mechanics implies that physical reality (the universe) consists of the collection of all observed phenomena and such phenomena do not exist independently of consciousness. In fact, the properties of a physical system are determined only after the collapse of the wave function; when the properties of the system are not yet determined, the system is not real, but only an idea, a hypothesis. Only when collapse occurs do properties become real because they take on a definite value. It makes no sense to assume that the system exists but its properties are indeterminate, because properties are an intrinsic aspect of the system itself. The collapse represents the transition from a hypothetical system to an actual system.
The collapse of the wave function represents a non-physical event, since it violates the fundamental laws of physics, and can be associated with the only non-physical event we know of, consciousness. Therefore, the only consistent rational explanation of the collapse is that it occurs because consciousness is involved in the process. However, the fact that properties are created when a conscious mind observes the system in no way implies that it is the observer or his mind that creates those properties and causes the collapse; I regard this hypothesis as totally unreasonable (by the way, the universe is supposed to have existed even before the existence of humans). The point is that there must be a correlation between the collapse of the wave function (=violation of the physical laws) and the interaction with a non-physical agent (the human mind); however, correlation does not mean causation because the concomitance of two events does not imply a causal link. The consciousness that causes the collapse of the wave function must be an eternal consciousness, that is, a conscious God. This is the idealistic perspective, which implies that physical reality exists as a concept in the mind of God who directly creates the phenomena we observe, according to the matematical models through which He conceived the universe (the laws of physics); the collapse of the wave function is a representation of the moment when God creates the observed phenomenon. This is essentially the view of the Irish philosopher George Berkeley, and in this view God is not only the Creator, but also the Sustainer of the universe. Idealism provides the only logically consistent interpretation of quantum mechanics, but most physicists do not accept idealism because it contradicts their personal beliefs, so they prefer an objectively wrong interpretation that gives them the illusion that quantum mechanics is compatible with realism.
Yes, that was bullshit. :-)
When he unscrewed the cap, the pressure of the air is what is pushing the water through the holes in the container. When he drops the container the the water is dropping with the same amount of force it would take the air-pressure to push the water out. If you had enough distance and you could accelerate the container fast enough, the air-pressure pushing on the holes would push the water up and out of the container.
That demonstration with the water bottle was inspired!
The water experiment was a great demonstration, but a poor experiment. The water sprays out from the holes because the water above is exerting pressure (gravity) on the water below as it pushes it out, where it then continues to get pulled down by gravity. When he dropped the bottle, ALL of the water is now in gravity's grasp and freefalling where it is no longer pushing down on the water below. So the pressure ceased, as did said jets of water spraying from the holes.
Again, great demonstration, as exhibited by 5 years of comments taking note of it, but that doesn't make it an accurate depiction of what's actually taking place.
@@themcserdwar yes it depicts accurately. Because it proves that the water does not feel any pressure as its free fall is its natural, undisturbed existence. Natural existence is not described as being motionless, it is described as being in motion exactly as curved space determines it. And we live in a curved space because of gravity.
@@Surmoka When you free fall from a plane you may live in what you perceive to be a pressure free, natural undisturbed existence, save for those pesky air particles smacking you in the face on the way down. But then you encounter the earth, which also smacks you in the face, though quite a bit harder than those air particles.
We might not fully comprehend gravity, but we certainly live with it, and it doesn't go away when someone performs a neat party trick.
@@themcserdwar exactly, you are in a natural existence until you crash into Earth, if we ignore air resistance. Because, from your perspective, Earth just rushed up to you and hit you in the face.
And this perspective is just as valid as the one from where you look like falling.
This is not a neat party trick, it is a fundamental aspect to understand relativity. And yes, we comprehend it, it i works. And it's the one that works, proven experimentally countless times.
Zero gravity=weightlessness. Freefall=weightlessness. Hence, freely falling objects do not experience gravity at all. It follows that it is not physically correct to say that objects are in a state freefall if and only if they are pulled by the force of gravity since they cancelled out the force of gravity to begin with.
When Dr. Greene said “(Dr. Einstein) was tied to a philosophical perspective of the reality”, was is just me? or Was there anyone who think he was made a joke.
“Strings Theorists” have been both Philosophically and Psychologically tied to that theory, which they knew decades ago that it’s not real. Einstein didn’t hate or regret about Quantum Mechanics. He was smart enough to realize that it was Easier, Closer and Better to disprove than to prove.
Well, It’s a very low probability, but to be on my safe-side; Even if it was real, it could not be proven/proved (Stupid Grammar) ....
Unless they can prove ‘there are 24+ dimensions’ + ‘all waves and particles are basically come from vibrations’ + ‘Quantum Fluctuations is real and our bubbly universe didn’t need any temperature or pressure to form’.
M-theorists are tied to their perspectives, they spent billions of $$$ to build useless tunnels and Star-War-liked Laser Toys.
So, Dr. Greene might be joking about that, or he might be one of those tied-up Physicists.
Yes, but no.
String theories is basically another einstein version of simplified theory of universe.
And particle accelerator built to study quantum physics, not satisfying anybody lust.
Dear Publisher, Please make following corrections:
at 14:30, acceleration does not bring "Gravity" into "existence", Gravity was still there, acceleration makes it perceptible, i.e. it brings "Gravitation" into our perception.
Brian talks like he's about to sneeze.
I wished this guy was my professor in college ❤️
that doesn't look like gravity disappearing, it's more like gravity applying to 2 objects equally.
Yes you could say that but it's all the same. The moment the objects start falling, FOR THEM gravity does not exist any more. For you it does, because you see the objects fall. But as we know, all motion is relative and your truth, being an outside observer, is no stronger than the bottle's truth that experiences weightlessness and its surroundings accelerating upwards.
Normal calculation: 2+2=4
Quantum computers: Perhaps...
"spooky action at a distance" (Eng.) = "spukhafte Fernwirkung" (Ger.)
"spooky" = "spukhaft"
Loved the analogy of the elvator speeding up in free space. But 8f thats the case , why does earth stops "rushing" towards you when you are above it in space ? By this theory , even if your are in outer space above the earth , the earth shoukd rush towards you ? Right ? Anyone ?
Brilliant watch
Tw!zted Metal idiot
Tw!zted Metal ur still an idiot.. lying idiot
What am I lying about, fool? Perhaps you're the one who is lying?
Tw!zted Metal no am not u are i know better. i understand this world better
Ivan Ereiz What is he lying about?
All he explained in the video and experiment was simple high school physics, and still the audience seemed so impressed.
@jesusbermudez6775 Got notification for such an old comment from TH-cam on your reply! Great to know you found it informative. Ignore my naive comment, I was bit younger then 😅