How does Hawking Radiation REALLY work?
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- เผยแพร่เมื่อ 25 มิ.ย. 2024
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Nothing can escape black holes, yet somehow they can lose mass by emitting Hawking radiation?! To understand why, we'll need to combine quantum field theory with general relativity.
00:00 Cold Open
00:33 Incorrect Explanation
02:22 What is a black hole?
03:57 What is a quantum field?
05:15 What do black holes do to quantum fields?
09:23 Black Hole Evaporation
10:56 Summary
11:43 Outro
12:08 Sponsor Message
13:20 Featured Comment
Nick Lucid - Creator/Host/Writer/Editor/Animator
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RELATED TH-cam VIDEOS
PBS Space Time on Hawking Radiation:
• Hawking Radiation
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OTHER SOURCES
Hawking Papers:
www.nature.com/articles/248030a0 (Paywall)
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Other Papers:
arxiv.org/abs/1511.08221
arxiv.org/abs/gr-qc/0010055
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IMAGE CREDITS
Stephen Hawking:
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Stellar Nova:
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Black Hole Accretion Disk Simulation:
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Black Hole Eating:
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Sagittarius A*:
www.eso.org/public/videos/eso...
Cosmic Microwave Background Map:
sci.esa.int/s/WLGmGdw
Carina Nebula:
images.nasa.gov/details-PIA14444
COMMON QUESTIONS:
*1. "Why does the evaporation speed up over time?"*
The wavelength of the radiation is proportional to the black hole's radius, which means the frequency (and therefore the energy) of the radiation must be _inversely_ proportional to the radius. The smaller the radius, the more energetic the radiation and the faster the energy of the black hole goes down. In the last few nanoseconds when the black hole is microscopic, the energy release is absolutely enormous.
*2. "What mechanism converts the curvature into particles?"*
We don't actually know. To predict Hawking radiation, you have to use relativity and quantum together, which means you have to be _very_ careful. You need some kind of work-around for their incompatibility. Hawking's solution was to use a Bogoliubov transformation, which is non-local math tool. He was able to do his QFT calculations in two different patches of flat spacetime and then just connect them _through_ the curved spacetime of the black hole. It was a genius solution, but it also means there are questions we just can't answer at the moment. We need a deeper model that's consistent with both relativity and quantum before we can find those answers.
*3. "Do we have experimental evidence for Hawking radiation?"*
We do not. The Hawking radiation being emitted by black holes right now is too low energy to be detected. It's overpowered by all the other radio signals in the universe. All we have as support for it is how consistent it is with the rest of tested physics. The implications of Hawking radiation are also pretty compelling... and quite beautiful in my opinion.
*4. "Since all mass curves spacetime, does all mass emit Hawking radiation?"*
No. It's not the curved spacetime that's causing the Hawking radiation. It's specifically the event horizon. Since normal objects don't have an event horizon, they can't emit Hawking radiation.
Nick: "We need better nonsense."
Copenhagen Interpretation has entered the chat. Meow.
Nick: "No, I said BETTER nonsense, not just MORE nonsense."
Is hawking radiation basically the Unruh radiation you observe when hovering above the event horizon, but due to nonconstant spacetime curvature there's a residual effect even far away from the hole? If so, then hovering at fixed distance from a nonsingular mass you will observe the Unruh radiation that is analogous to the hawking radiation of a black hole with that mass. What exactly would be the difference between the two radiations and in what way does the event horizon make Hawking radiation special?
If a being was 4th dimensional would they be able to see through a black holes event horizon or would the see a complete absence of anything?
@@sarchlalaith8836 A 4-deminsional being would just look through that part of space either before the event horizon formed, or after it evaporated (if their 4-deminsional extent is that great. There's no reason to guess it is. My 3-dimensional existence doesn't allow me access to the 2-dimensional surface of the far side of the moon).
@@siquod no, Unruh radiation is the vacuum energy of empty space - virtual particles - that you would collide with as you fell into a back hole's gravitational well.
Hawking radiation also comes from the vacuum but converts the mass of the black hole to radiation due to the event horizon altering the quantum field of the vacuum.
My favorite thing about you is that you take nothing from granted. A bunch of huge name physicists are like hawking radiation is real and you're like... But what about the huge issues in that boiled down explanation? Then you admit to your own shortcomings as an educator and add that you're learning like the rest of us. That's what makes your explanations rewarding. You went through hell to make sense of it so that everyone can. We need more people with your humility, intelligence, honesty, and work ethic. Thanks for what you do.
Thanks for appreciating the effort 🙂
"Nullius in verba"
Sound like Feynman to me
I couldn’t have said it better
I never take anything from granite.
"We need better nonsense" is a perfect summary of quantum physics.
Don't worry. Reality isn't even real, by how we define it. And if the universe consists of everything within it. Then I'm technically a singularity.
@@angeloftimelessdispair1340 wut
This would be incredibly cynical if it didn't have so much basis in fact.
*also applies to religion
@@georgymusic with religion its like we don't need it at all
Incredible work. You are certainly one of the most underrated science channels out there.
Thanks Jon!
And the same can probably be said about your channel (with maths, not science)
Sweet set up dude!!
Thanks Jade!
Up and at them
-Radioactive Man
O woah.. I just saw you there at prof Dave explains channel.. he he he
@@Kj16V the goggles do nothing!
He teaches just enough for me to understand complex topics but also just enough for me to realise how little i know about anything
It's the best feeling isn't it. Learning something new but also learning that there's A LOT MORE where that came from
@@YounesLayachi lol yes! Its channels like his (even moreso than my course) that remind me of why i love physics!
Yup that's science for you :D. The more you learn, the more you are stunned by how much we 'already know' (or at least the scientists at the moment haha), it's pretty overwhelming. And even that gets overshadowed by how much we still don't know :P
You're not alone!
Even the brilliant Richard Feynman once said, "My students don't understand quantum mechanics because I don't understand quantum mechanics."
And "I think that I can safely say that nobody understands quantum mechanics."
So, what chance have mere mortals like us got?
The more we can understand, the better but it's clearly not realistic to expect to have a full understanding of quantum mechanics.
In my case, he teaches me enough so that I suspect that the usual "explanations" (which never make any sense to me) are wrong - and that a solution, which I now almost have a clue about, might be possible.
Outstanding. I have already described Hawking radiation to my students using the common explanation you described earlier, and then I finished with "but these are really just lies to children." I explain that it is a model meant to simplify rather than provide an accurate explanation. Your model is far superior yet still explained in a way that students may grasp it. I will reference another one of your videos for those who would like an improved model!
The quantum buzz of particles is explained as and taken so literally. Its hard explain to people that its just a metaphor of sorts.
@@Doomfullord how can a metaphor shrink and explode a black hole?
Wow, our school system would be so much better if every subject had master class tutorials by amazing teachers like you, who craft each lesson optimally, and actually take the time and effort to understand what it is they teach.
train the trainers, spring to mind
I am a professor in Micro and Nanosystems (basically applied physics), devouring your videos and learning new things, or at least new perspectives, in most of them. Keep up the great work! You inspire me to inspire others in my own teaching.
Hands down the BEST description of this I've ever heard.
"we need better nonsense" 😅 this cracked me up
When he's right, he's right.
Ahah right!
I can't believe nor comprehend Black Balls can bend space-time hard enough
3:34 ~ ref
Models are not actually the stuff they are supposed to represent (hence models)
So its always nonsensical to look at it through other aspects of what it is trying to represent.
That's why models will always be nonsensical what we always need are once that are less nonsensical than the others hence more nonsense
@@adityabhatt4186 it's like boy and girl are more than a friend but less than lovers x'D
I watch a LOT of physics and cosmology videos and this is by far the best explanation of Hawking radiation I ever seen. Thank you for finally answering some of my lingering questions!
Glad I could help. A lot of research, thinking, and planning when into this video. I'm really proud of it, so it's nice to hear other people appreciating it 🙂
It’s pretty amazing what you can convey in less than 15 minutes. For years I’ve had the same questions you’ve had. The concept as it is usually explained just didn’t pass the sniff test. I recall watching a video featuring none other than Leonard Suskind who has made a large part of his reputation on black hole physics where he gave that same hand-waving explanation of virtual particles forming at the event horizon. It was immediately obvious that, if one of the virtual pair was trapped inside the event horizon, the black hole would not lose mass and evaporate. On another note, I believe that black holes are the key to unifying QFT and GR. They are enormous enough to conform to GR (their existence was predicted by GR years before any experimental evidence was available), yet they are essentially quantum objects having only three properties, mass, charge and angular momentum just like a fundamental particle. Thanks again for the refreshing approach. I always look forward to your posts.
It changed my whole view on black holes to because it wasn’t making sense to me how the mass just stopped being accessible. Then I realized mass can be converted into energy and that’s what happens over a REALLY long time
Great comment! Thanks :)
As a connoisseur of physics videos on TH-cam, this is by far the clearest, most instructive explanation of Hawking Radiation I've seen. Thank you. I know you inspire lots of young people, but letting you know you also inspire some of us older folks, too. Thank you for the great work you do!
The guitar string analogy is exactly how I learned about Hawking radiation. Makes so much more sense than the particle/anti particle analogy
Sounds like you had a great teacher.
Wow, being obsessed with black holes, this is the first time EVER I finally grasped how Hawkings radiation should be possible. Thank you so much for your videos!
Nicely explained Nick, keep it up! =)
didnt expect you to see you here lol
🔥🔥🔥
@@baguettegamer5313 Papa Flammy is everywhere.
@@ScienceAsylum The Papa Flammy _field_ is everywhere, but that's not the same thing. You could think of it as there being a probability at all points of PF being there. But a PF event can't be in more than one place at the same time, even when the excitation of the nearby fans is very high.
@kwokshsee how do you define entropy and how do you measure the entropy of a black hole ?
I don't understand how fast you learn physics AND make videos on them AND make them SO good. I need your productivity in life.
It's a lot of work.
@@ScienceAsylum ❤️
I had the exact same thinking about why Hawking radiation could never be real. Thank you for explaining this important hole in my gap of understanding away, very grateful for finally "understanding" the elusive Hawking radiation through it's actual concept...for as far as that is possible for a novice in fifteen minutes. AWESOME
Glad I could help 🤓
You probably lost the imaginary time dimensions: strings can't vibrate backward in time uniquely at the event horizon, not in other areas. Only there.
There is no movement through time at the event horizon, but only spatial movement above the speed of light.
Just time for some vibrations is going back at the event horizon, they might be split, and take energy from that split.
This makes so much more sense to me than the original description. I always asked myself how the paired particle would mitigate some of energy from the black hole.
Mind completely blown but this makes so much sense now.
Yup
+
If you think it makes sense, you don't really understand it.
@@jamestheotherone742 very true. I think I just meant that it answered some questions that were puzzling me about hawking radiation in the first place.
@@jamestheotherone742 great party quote but not profound
Over 300k subscribers , but still seems underrated channel.
Definitely!
Who needs science when there are so many channels on TH-cam with horoscopes, paranormal, superstition, religion, conspiracy and tin-foil hats that also completely fail to answer everything.
All we can hope for is that one day people will realise science has testability, repeatability, and logic as a backround; the others have nothing but faith at best.
Massively underrated, definitely the best science channel out there
facts
Wow! I'm back to this channel after almost a year and still this man is nailing in-depth explanations.. Keep going!!
Nick, you are a shining example for us all. In Little League baseball, when they train umpires, they exhort the volunteer parents, who, though lacking in confidence, step up to be volunteer umpires, to call the game they see, not the game they want. In the world of physics, where this sensibility seems to be eroding (see Hossenfelder, Lost in Math), you model the right relationship that a human intellect should have in studying and delighting in the physical universe. This helps us all to gain confidence and share in that appreciation and delight. I have to think it takes an incredible amount of work and rework for you to put all these explanations together. I am profoundly thankful to you for doing this work. Michelle and I are also thankful for your account of autism. And also for featuring your wife in some of the videos. Such constructive work can only take place with the help and support of others. Thank you both. We appreciate your effort.
Thanks. These videos do take a lot of work. There's a reason I can only release one video per month, and that's it. Most of the time spent is researching and writing. The post production (editing and animating) only takes 1 to 1.5 weeks.
The thing I like about you is that you START where all the other videos on such topics LEAVE us with. You truly are a masterful explainer. Keep being awesome!
Thanks! 🤓 I try to fill a need.
I watched this with my daughter. Quote from her. "He's much better at explaining things than my teachers" :)
Than vs then
@@vashon100 found the teacher.
@@MeppyMan lmfao xD
Very true, but keep in mind that will almost always be true of scripted recorded content vs live presentations
@@vashon100 corrected
Easily the best explanation for this form of radiation I've EVER heard.
Thank you very much.
Thanks! Glad I could help 🤓
I keep thinking I understand this, trying to explain it well enough so I can properly articulate a related question I came up with, and realizing I didn't really absorb it all. This is the third time I'm watching it and I'm realizing just how much complicated information you managed to fit into a short video while also making it engaging and easy to follow. I didn't even realize how nuanced this was the first time I watched it because you made it seem so simple and almost effortless to explain.
It takes real talent to take something complicated and make it simple without making it _overly_ simple, and to make it look almost effortless is even more impressive. And then making it engaging too! The quality of your videos overall has improved a lot ever since you started doing TH-cam full-time (not that weren't quite good even before that) and this video in particularly really impresses me. I like it almost as much as your video on how SR fixed electromagnetism (that's still my absolute favorite as it made electromagnetism as a concept suddenly make a zillion times more sense than my textbook did) but this one is a close second.
Keep up the great work Nick! Looking forward to your next video. :)
Thanks! This is definitely in my "top 5 video I'm most proud of" list. It's nice to know it's appreciated 😊
@@ScienceAsylum Which video are you most proud of?
@@Lucky10279 My sphere packing video with the Earths in the Sun 🤓. It might not be everyone's favorite, but that's ok. It's my favorite.
@@ScienceAsylum What is it about that one in particular that makes it your favorite? Was it just really fun to make?
Finally, someone with the balls to showcase the actual explanation. Another good video.
Black balls in space
Thanks to Science Asylum for making my morning by posting this video.
And it was 8 pm in India here
So wut?
@@freezinfire åääääåäåääåäääåä
I wonder what the TH-cam award in his background is for.Whatever it's for , he deserved it.
Imagine the crazy dynamics of a universe with nothing left but evaporating black holes, who now and then are "refilled" ever so slightly by the explosions of another nearby black hole at the end of its life. We have something like the Game of Life going on for real where each "cell" is dependent on the life cycle of its neighbors but over crazy time scales.
8:48
200 years in the future: "Nick Lucid discovered the flowton in 2021, he solved one of the greatest mysteries of the universe, he would have won the Nobel prize.
😂
I thought Flowtons were the inevitable and irretrievable bits of pet fluff you end up with in a glass of water. Maybe it’s a quantum thing after all
I listened to it multiple times, and it doesn't sound like he ever accidentally said "flowton". all I ever hear was "photon". I can't hear a difference.
@@Metal_Master_YT Same.
Finally, a popular explanation of Hawking radiation that deals with the reality of quantum fields instead of virtual particle pairs! Thank you and well done. I'm a self-taught physics amateur who has studied some QFT in curved spacetime, but I've only received confused looks every time I've tried to explain this amazing prediction to friends.
Next time I try to explain this topic I will recommend this video.
I will now forever see you with your arms over your head saying that line when ever I hear or say "CONSERVATION OF ENERGY SHALL NOT BE VIOLATED!" Thank you.
Please make these videos forever. You are the best teacher I have ever seen.
2:15 “As long as you understand two things; black holes and quantum fields”
Nick, I’m gonna have to stop you there.
Really though I love the explanation and it definitely opened up some good insights for me.
Yeah, it is a PITA having to limit myself to relativity and q.m. when I have a perfectly working TOE.
It's a bit like doing calculus on an abacus.
(I wish. Hope I live to see a working TOE that combines both space-time and quantum mechanics 🧐)
Virtual particle: I want to cancel myself out
Black hole: NO
Virtual particle: so, you have chosen death in a Googol years.
Vengeance must be served cold, but this is very very cold...
This explanation was so good I finally got the last click “I get it” fragment to understand the basic idea of this insanely complicated topic.
Glad to hear it! 👍
So light can escape a black hole via Hawking Radiation?!
@@damanybrown5036 It depends on what you mean. The energy that used to comprise what was infalling light does. But the Hawking particles have none of the information of what was infalling particles.
@@mathnerd97 so Hawking radiation is electromagnetic waves or no?
@@damanybrown5036 most of it is
this is the best channel to watch if you're having trouble understanding a physics concept. your explanations are always the easiest to understand.
I discovered your channel when I was trying really hard to understand a very difficult concept (Tensors). Every single YT video I watched felt like the person was reading straight out of a textbook. You're the only TH-camr who actually helps me not just understand but visualize difficult concepts. I get excited when a new video of yours pops up.
Thank you for taking the time to explain things in a way that is easy and enjoyable to understand. You rock.
By the way, cool shirt!
"We need better nonsense" Such a Lucid thing to say..
im glad i found this channel because as a theoretical physics enthusiast, being showed all these concepts in a simplistic and understandable medium gets me very excited about the universe.
By far the best explanation of hawking radiation on TH-cam
Best explanation of Hawking radiation I’ve ever witnessed.
The issues with the virtual particle picture is exactly why I never believed in Hawking radiation either... until now 😅
Yay....New Studio. The tone and pacing difference was noticeable. I like the slow pacing and sob, it lets me absorb stuff, the earlier pacing went by too fast and I had to re-watch it multiple times. I think you are still thinking about removing the humor, but this amount is always healthy. Keep growing, our best wished is with you.
I don't ever want to remove the humor from my channel. I'm just trying to find a tone and pacing I can sustain.
@@ScienceAsylum Good, we like your corny jokes. The asylum needs some weirdness.
Awesome video! I might have to watch it a few times to really understand it. I can't believe I just accepted that particle anti particle thing all this time! Thanks so much!
This video really gives another insight for non specialists on this topic which is not easily understood. Thanks for spreading valuable knowledge.
1:20 oh *SLAPS THE TABLE* finally someone said that this explanation is ridiculous, I mean Space Time did it too but what they said was a little too much for me
Yea didnt want to be the party pooper but Matt already explained why the particle version is just an "allowed approximation". Personally I always found it ridiculous because to me that would mean that the antiparticles should have negative mass, and even though there were not many experiment to measure their mass, so far it seems they have the expected normal value for it. (and just to be clear, even if antiparticles would have negative mass one should explain why would the anti particles be the ones which are preferencibly fall into the hole and why always the "normal" ones would escape. In case of a pair production it sounds 50-50 to me, which would mean that any negative mass falling into the hole would be canceld by the positive ones) So then the question, how can you add the mass of any normal particle or antiparticle to a black hole and still make it less massive?
@@CraftyF0X nicely summed up
I totally agree xD
@@Nyan_Kitty civilized discourse, right there folks:)
@@CraftyF0X Now it might seem childish but to me it looks like that antiparticles reacts equally with even spinn bosons and in an opposite way with odd spin bosons, and since the gravity particle must have a spin=2 than antiparticles and normal particles should behave the same way with gravity. Also, if conservation of energy is a thing than all antiparticles must have a positive mass
I am sure we would see Nick Lucid in the history of science as a major impactor..❤❤ If not for his contribution then absolutely as a teacher..
I don't know how I missed this in my sub box. This is so cool and I've been waiting for an explanation like this.
Glad you finally found it 👍
Loved the fringe reference. Great show.
I really enjoyed the reiteration of the concept after all the key points were presented - some of your older videos lacked such a reiteration, and it really helps tie everything together and put a bow on your glorious knowledge packages :)
Cool 😎. Thanks for the feedback.
"We need better nonsense."
-Nick Lucid
Truer words were never spoken.
Is truer a word
That's why Dodgson wrote _The Hunting of the Snark_ - the _world_ needs better nonsense
El hecho de que haya puesto en duda lo dicho por Hawking me encanta. Eso es hacer ciencia. Todo debe ser puesto a prueba siempre
Another amazing video. Many moments made me stop... and realize that I was understanding something on a whole new level! What a great channel! All the best from Toronto
Yes, the video did help me to understand this concept a little better. And you're right, the idea of such blemishes in spacetime being gradually smoothed out by the universe is beautiful and the unimaginable lengths of time this housekeeping involves is simply staggering.
Thanks for the help on virtual particles. I've never been able to reconcile the common phrases science-educators use for us lay-people like, "empty space is a bubbling, boiling brew of virtual particles popping in and out of existence" with "virtual particles are just visualizations in Feynman diagrams to make the mathematics work". This video was really helpful.
I'm new to this channel but with your explanation about mirrors and my favorite the hawking radiation you really got me. Thanks for your cool videos.
Truly amazing, I was also wondering from where those virtual particles were coming up but you clarified it. Thanks a lot for making this video. Really an appreciable video.
Released after an update to Black hole image
What a legend..
Nick, this is a masterpiece.
Science communication has come a long long way since the 1970’s. I still blame Hawking for telling the story using words he knew would be misleading, yet technically correct. Even today, the story at the beginning of the vid is repeated constantly.
I also think the work Hawking and Penrose were doing was so advanced that an ‘old school’ particle physicist at that time would not get it.
His ‘story’ was as much for physicists as the general public, imho.
The confirmation of Bell’s Inequalities was about concurrent with this work, iirc, so there were still a lot of physicists that still believed in particles as little balls of stuff instead of excitations in quantum fields.
Best explanation video possible, for as broad an audience possible.
That helped me not only understand Hawking Radiation better, but also quantum fields and virtual particles. I always feel like understanding of these concepts for me is always a slow, additive process for me, with small insights building up over time into actual revelations.
I'm tempted to call it an accretion, but...yeah. Anyway, great video!
Glad I could help 🤓
Been so annoyed of the inaccurate antiparticle explanation for so long, this is a welcoming relief. Very nicely explained. Thank you. Why must others continue to confuse us with explanations that breaks the laws of physics.
I'm a little uncomfortable in this new wing of the Asylum, but wanted to say thanks Nick! You have made me almost understand things I never thought I would at all.
Saw this same topic on PBS Space-Time. Came away understanding that I didn't understand Hawking Radiation. Thank you for explaining it so well. Hey, you should be a teacher 😉
Wow, that was amazing. I watch several channels that are dedicated to teaching science, but you are explaining things in such a way, it is a pleasure to watch.
I am not sure if I got it right, but nevertheless: When you explained that less energy/mass means less curvature and a black hole is exactly this - extreme curvature - and that is the reason why the black hole shrinks... My mind was blown! Wow! Thank you so much!
Man, I remember when this came out and I watched it and said cool cool, and then I took electromagnetics and signals and systems for my major and that wave description hits differently. Thank you Nick for this awesome video, aged finely like wine for me.
This video is up there with the one about gravity being primarily caused by gradients in time as among my favorites. Your videos make me wish I had followed my interests in science and physics years ago when in high school. If only I’d had teachers like you back then....
I kind of knew this but in a more Jargon way. This makes it so much clearer and easier to understand.
Thank you very much for making this much needed explainer. Ever since I read " A brief history of time" I always had my own problems with this phenomenon.
Best explanation of Hawking Radiation on TH-cam.
New set-up
Thank you for teaching physics in such an understandable way, truly. I always have been fascinated by how our reality works, and extremely frustrated I couldn't understand so much of it. You are really a good teacher and I am so grateful for your work.
This is the most appropriate description of Quantum Fields bro. Love your work!
Your explanations are always truely marvelous!!!👍👍👍
Thank you, Nick. That looked really difficult to research and you did a fine job of explaining things.
Thanks! It was a lot work, but worth it.
This was the best explanation of Hawking Radiation I've heard. Easy to understand.
This was an epiphany. The string analogy has cleared up my questions and suspicions about Hawking Radiation as well. Thank you, oh man thank you. I feel better in that way that only edification can make you feel.
Glad I could help 🤓
This was the best "Nonsense " description I have seen! 🤯 Great stuff man.
I was just discussing this with my son today.
I was explaining how it was all to do with virtual particles popping into existence at the event horizon.
Thank you for proving to him that his dad doesn’t know anything useful about physics. 🤓
From now on he can watch your videos if he wants to know anything!
I still appreciate the effort you took trying to explain it to your son 👍
Admit it, underneath you were all "Screw you, Stephen Hawings, screw you ! ":)
Oh wow. I learned so much from this video. The event horizon particle explanation never sounded right to me because why wouldn't they get trapped in the black hole's gravity well? I never thought about "pinching" quantum fields. Hawking radiation makes so much sense now!
You got me at 4:00
I like the way on how you find it to be a huge task to explain quantum field
Brilliantly explained, professor. Kudos.
Thank you so much Nick...No wonder why Hawking picked the layman's terms, the logical explanation is nuanced.
Approaching this from the wave perspective makes a lot more sense! As always please keep it up!
This is really insightful, i wondered how a black hole would decay at the end of the known universe. Also helped me understand what the heck hawking was talking about. Great video overall 👍.
just stumbled across this channel. so good.
This was actually a huge help. Thank you!
As always your the one person who makes sense, and doesn't just repeat the same thing as everybody else on difficult concepts and ideas! 👍👍
Thank you so much. This is literally the best explanation in this universe.
(No pun intended for all the aliens out there)
Finally! Nick has provided an accurate presentation of Hawking radiation! The very first time I read about Hawking radiation and thought about individual virtual particles being pulled over the event horizon, dozens of questions began popping up in my mind. Several of them were exactly the same questions Nick asked at the beginning of the video.
Nicely done, Nick! Your’s might be the first physics channel to present this concept accurately, at least the first I’ve seen after watching science TH-cam channels for a few years. I no longer sound like an idiot asking (in Nerd Nick voice) “How does *absorbing* mass lead to mass *evaporating* ?!”, because I don’t say things like that anymore as it was never accurate.
Lastly, I’m not sure how I missed this? I’m still subbed, have been for a while, but I clearly missed this one when it came out.
Seriously the best explanation of Hawking radiation that I've heard. Thank you
Yes, this very much helped me understand Hawking Radiation a lot more, and a better way of describing black holes in general. I also laughed a couple times which is rare lately, thank you for that.
"In fact I had every intention of this video being a debunking extravaganza"
*You what??*
You actually did help me understand it, well done
"Black holes aren't material things -- they're spacetime itself."
I shared this video with someone claiming hawking radiation is nonsense, thinking that maybe he'd only heard the surface level virtual particle explanation, and he _really_ didn't like that you said that, though he never explained exactly what his objection was. But in trying to reason with him (he was _very_ stuck on the idea of it being nonsense and was insulted that I dared to question his claim of "knowing everything about Hawking radiation"; in hindsight, I probably should've disengaged the moment he made such a claim, but oh well) it made me think a lot about that statement and now it's gonna stick with me. I'm glad, because I think it's very insightful -- the idea that gravity (which is really all a black hole is) is a property of _spacetime_ rather than a force acting on matter is just so cool!
Some people really do get stuck. It's sad 😞
Wow, that's really cool. I've never heard this explanation despite being very interested in physics, general relativity, QM, black holes etc. for a long time.
I see the subliminal advertising hit it's mark :)
Earlier I had this confusion if virtual particles are just mathematical gimmicks used to solve equations how come they evaporate blackholes but after watching this video I think understand a bit more. They are virtual as long as there's nothing around! Thanks Nick.
Wow! Thanks you! I had the same questions about the virtual particles fallen and adding to the mass of the black hole.
This is so much more understandable.
Bro, that was an awesome description and visual aid of a quantum field!