Physics students of the 60s had the Feynman Lectures in print form. We have a Sean Carroll KZread playlist. What a time to be alive.

@richardlinter4111

4 жыл бұрын

@Astute Cingulus : Quite right, but GR can be extrapolated to the Planck scale. It's just that doing so we find it disagrees with QM. This I believe is actually Sean's point, or one of them.

@richardlinter4111

4 жыл бұрын

Amen.

@ssshurley

4 жыл бұрын

Jeremy Roy Your right. I bet they were loving the print lectures. Hahah

@tricky778

4 жыл бұрын

In the 60s they had Feynman lectures on cine film, in person, and had tutorials with him directly, plus drinking with him I bet

@GuRuGeorge03

4 жыл бұрын

we are living in the McDonalidization of knowledge. Type a few words into google on a device the size of your hand and nearly all knowledge of humanity is literally at your fingertips. Now we just need people to enjoy it as much as they do McDonald's

Hey, sorry for the mixup with the previous version of this video! Somehow I uploaded the wrong version, I had to delete it. This one should be better in both audio and video quality.

@Nietzsche_K_Gote

4 жыл бұрын

I love listening to you explain about things I never and always knew I as curious about

@CuriousCauliflowerX

4 жыл бұрын

Less tearducts, more physics, great!

@seandimmock5813

4 жыл бұрын

Sean Carroll let us know when that textbook is out!!!! Can’t wait!!!!!!

@coecovideo

4 жыл бұрын

All good, thanks

@bombproofmetal

4 жыл бұрын

All of these videos have been amazing thank you so much for your hard work.

I am artist with very little understanding of physics. I have been so interested in my whole life, and five or so years ago, gave up on my attempt to understand or appreciate the subjects that you've been teaching in this series. This is exactly what I've been hoping for for so damn long! I have the drive to learn more about this stuff again. Every episode starts with me doubting myself, that I'm too stupid to get it, and ends with my mind being blown, and feeling like I have a new outlook on my ability to understand... well, anything.

@schmetterling4477

Жыл бұрын

You are correct. You have very little understanding of physics. :-)

quickly becoming my favourite series on KZread.

@rage9715

4 жыл бұрын

Hope it continues after the lockdown even if he does them less frequently.

@rage9715

4 жыл бұрын

@Astute Cingulus I miss carolin crawford/Ian Morison both fantastic speakers.

@yishaimendelsohn620

4 жыл бұрын

Ditto

@jolly39j

3 жыл бұрын

@@yishaimendelsohn620 too For for the day that we wayHome From At f get rest f, to get d74^3

How lucky we are to have people like Dr. Carroll willing to share their knowledge of physics with us! I love it.

Entanglement, yes! Been trying to get my head around it for awhile now, every time I think I have it there's more around the corner, angular momentum was an entire rabbit-hole on its own. Thank you for sharing your knowledge Sean, your videos are my favourite for explanations of complex ideas.

@scottmiller4295

4 жыл бұрын

this may be off, but i simply think of it as particles sharing information aka energy and the more they share the more entangled that they become. to the point you get stuff like us. any time particles interact in the universe and share information i tend to think entaglement is all over all the time and not wierd at all. i look at information as the key and the type of information secondary. but i could be and probably am way the hell off.

@billyjoe2128

4 жыл бұрын

Complex ideas?? Just being plugged in and realizing nothing is impossible. Upward and onwards All day everyday

@Wandering_Chemist

Жыл бұрын

I would read Nobel Prize winning John Bell’s book, “Speakable and Unspeakable in Quantum Mechanics.” To really understand his Nobel Prize winning theory that was confirmed experimentally, Bell’s Theorem.

I think in episode two of this series ‘Carroll’s Cat’ certainly was not sleeping. Good video.

Love that every so often Sean's hand slips in and out of "phase spacetime" when he becomes more demonstratively excited! Always thought he might actually be a many worlds traveler. Confirmation; seeing is believing!

You’re really good at making the equations seem less scary, and explaining the reason behind the numbers.

Favorite video in the series thus far! Thanks Dr C.

This was my favorite of this series so far, and they're all great. Brian Greene also provides a really good explanation of Bell's Theorem in "The Fabric of the Cosmos."

You’re the man Sean. Thank you for doing these.

I can't wait for the upcoming class/episode! Mr. Carroll is the best "teacher" (I've watched quite a few online) in QM I've come across. Really hope he continues to produce classes (and alike) about QM for the unforeseeable future!

Thank you so much Mr. Carroll for these series of videos. It's my end of day everyday and I've been learning a lot about these subjects. More than the lectures and I've seen a lot of them. Thank you so much!

A 1:20:29 long video on solely entanglement. This is unique

The best explanation of entanglement I've ever heard.

These talks are absolutely phenomenal. Prof. Carroll is an excellent educator, who is able to convey very difficult topics in an easy, understandable manner, making them reachable for broad audience without scientific training. Thank you, prof. Carroll!

Wooo! Been refreshing the page all day waiting for this :)

@paulmichaelfreedman8334

4 жыл бұрын

Or you can click the bell icon.....

best podcast ever. i had to rewind a few times to get things again. you're a great science communicator, thank you so much.

I had some sadness in my life related to the covad-19 thing. The only way I could remove my self from the sadness was to watch this video (I read your latest book). Your talk took me to another place where I had to think really hard to follow along. Not that I understand it all, but it is so very helpful. Thank you.

@brucegoodwin634

4 жыл бұрын

I hear your pain. Take a hug? Keep plugging…

@TheAuriconGroup

4 жыл бұрын

@@brucegoodwin634 Thank you so much Bruce. Yea, I will take that hug and back at 'ya. I am so very pleased that Dr. Carroll is doing this series. It expands my mind. What a wonderful thing for him to do. It is like the best collage teacher you ever had.

Wow! - Entanglement in a purple hot tub! Isolation doesn't get much better than this!! Thank you Sean, for the highlight of my week :)

Thanks for posting, surprisingly easy to follow. 👍

Sean, I downloaded the "Universe Splitter" app that you mentioned In your book, "Something Deeply Hidden," which I am still enjoying reading. I asked it if I should "Study physics" or "Waste my time." It told me to waste my time. A few minutes later, I asked the same question again. It told me to "Study physics." I now feel myself in a superposition between studying physics and wasting my time.

@Cooldrums777

4 жыл бұрын

Dean Batha No. You have split into two worlds. In one world Dean studies physics, in the other world Dean wastes his time. Since you are watching this videos the Dean I'm responding to now is studying physics. In the other world, Dean never bothered to post this comment on KZread and is wasting his time. LOLOLOL. Dean was in a superposition BEFORE you used the "Universe Splitter" app. That in a nutshell is many worlds.

Thanks for the podcasts and videos. I appreciate you.

OH MY LORD. I never thought I would understand entanglement. Sean you are AMAZING.

I so enjoy these lectures! With the entanglement episode, you made me think of the story about the blind men and the elephant. Each touching a different part of the animal and from that having an opinion about the nature of the creature. It is hard to state what the entirety of something is (and exciting!) - not knowing the whole creature… Thank you so much! Henry B.

This is probably the best talk so far of a great series. I finally understand (a little) "Many Worlds," which had always seemed ridiculous to me. It was the orthogonal axes that did it.

This is so enjoyable. Great teaching. Thank you for doing this.

Very interesting stuff explained in a way everyone can understand it. Thanks, Sean.

Amazing how fast you can make these videos -- I love the quarantine :)

I have heard about entanglement many times. But this was super duper explanation Professor! Finally it does not seem as a pure magic for me anymore. Thank you for this.

47:00 A interesting observation I had one day. I was entering the mall one day and some doors were automatic some were of the manual variation. You could see by the wear in the ground how much each was used. It reminded me of the double slit experiment. But it was people and shopping destinations.

Thank you! for making more accessible, these highly abstract and technical concepts to those of us who love physics and...and assuming we're not stupid! SC a fantastic human being, thank you sir for sharing!

These videos are very much appreciated thank you so much.

If you want to see a great man with no pretentious ego, Sean Carroll is one such !!!

Another great video, Professor Carroll! Also, I have read the professor’s latest book, Something Deeply Hidden, and I highly recommend it to anyone who really enjoys this video and wants to learn more about the foundations of QM.

@tripp8833

4 жыл бұрын

Learn linear algebra if you want to actually get the foundations of QM

@johnp1

4 жыл бұрын

Another good reading: Sean's CV. It's impressive. www.preposterousuniverse.com/cv/

@avadhutd1403

4 жыл бұрын

Please share Ur insight 1.whats Ur thought on experiment that monkey is sit on type writer and one of possible worlds it creates Shakespeare play ,or quantum immortality,these are the weird implications What's Ur thought folks please share

@isabelab6851

4 жыл бұрын

tripp I look that in my first year of college in 1981! I have not used real math graduation

Thank you for taking the time to do these videos they are great. You are respectful and dont assume you are talking to a room full of kids thanks for all the details and real explanantion this is a very valuable video series.

The fact that im listening to many quantum physic explaination doccument video or podcast or conference show how small we know about it because almost if i click anywhere in the video after 5 minutes we always comeback to talk about the particules react diferently in the observer point of view and in real life situation when the influence of the observeris not there or because the observer cannot see because its something to see its something that behave and change state. if find it really interresting to listen because i dont dont know if its the same thing as someone who is learning a language and by listening a lot of it you are able to figuere it out more and more in your head. Now that its been almost 5 years where i listen almost everything i can find on the subject i can more and more represent it in my head . Thanks for doing your job that way thats a great way you are a great speaker too .

Thank you for all of your lectures, you make complex subjects more understandable, (although I can't follow the math). I wish I had a instructor or they told us this stuff when I was a kid I might have gone into Quantum Mechanics.

Thank you, Professor Carroll.

Fantastic body of work with these videos. Well done. Keep it up.

I'm glad that I live in a universe that has people like Sean Carroll. I never get tired of reading his stuff.

Sean, very smooth talk, I really like it. You used two particles/waves collision as an example for entanglement. It makes sense to me but this is the first time I hear that kind of use case in entanglement. The two particles collision case can be seen as following Newton’s 3rd law of action vs reaction, although this is QM which makes Newton’s law dubious. A more interesting case is the action over distance in gravitational force. Has anybody tried to apply the entanglement idea to explain action over distance in gravitational force? It seems there are different types of entanglement. The spin-based entanglement is one type, the two particles/waves collision you mentioned here is another and the action over distance in gravitational force is yet another.

This has finally answered my questions on entanglement, I love popular science descriptions, however at times, you just need to run through the fundamentals.

OMG! From the 1st lesson about basic calculus, Sean reached the point of negotiating the deepest questions of the present. I'm afraid this means that gradually this wonderful series is coming to an end... :( Anyway thank you so much Sean...

You have quite the visual style, Dr. Carroll. It reminds me of '80s era VCR tapes for some reason. Love all your content.

@stephenkamenar

4 жыл бұрын

i like the intro with his floating head in space

Thank you so much Sean!

This is really good informative stuff Prof Carroll. I really want to thank you for making all these videos - this one in particular. The nature of entanglement and quantum decoherence leaves me wondering if it will be possible to actually build a useful quantum computer - or if decoherence will present insurmountable technical problems

Biggest entanglement in your lockdown hair X I so enjoy your stuff. Thank you.

Love this topic. Thanks Sean

Your version of Schroedinger's cat doesn't work because the cat is likely to be asleep either way

Thanks for these videos. Wish I could buy them.

Really nice lecture, thank you very very much sean :)

I just discovered this series of videos, and I'm like a vegan in a tofu store. Any update on the undergrad quantum physics textbook mention at 1:38? I searched on Amazon and at preposterousuniverse and didn't find anything. Thanks so much for this great series!

I really appreciate how neutral you are with your preferred theory while being objective in fairly expressing the alternatives. That said, many worlds feels an awful lot like string theory to me, though instead of making up n dimensions, we make up n worlds. Something about it feels off to me. But that's just a suspicion!

@KungFuKeni

4 жыл бұрын

I suggest you watch the many worlds part of the video again. Sean Carrol is trying to stress really hard that the many world's theory does not 'predict/assume' the existence of other worlds/universes. The theory just states two postulates which IMO are unequivocally true. The 'other worlds' come about when you try and attach meaning to the theory, ie how you INTERPRET the theory. Ofc the other branches of the wavefunction cannot just be ignored, after all they must be there for some reason, but you shouldn't be dismissing the theory just because it's hard to interpret.

it helped me so much to read his book first and then watch these videos :)

I like this format with the virtual blackboard

I barely understand algebra, but I still listen to these beginning to end with complete interest. thanks sean

@_Nibi

4 жыл бұрын

k

This is amazing thank you.

This playlist is gold

Thank you Prof. Sean Carroll for this passionate thorough and science loving presentation about the subject of QE and not only and specially for its interpretation in the the many worlds theory context. I kept and cherished specially your phrase that decoherence is the entanglement of the quantum particle with the "environment". QE, superposition and all the "quantum weirdness" could be resolved by simply examining that what is very obvious possibility for me and was all the time in front of our nose, that vacuum 3D Cartesian space is a medium in an underlying intrinsic superluminal energy state and that our matter Universe is actually the phase transition of this superluminous medium to luminous or lower energy states. In this context, all "spooky actions at a distance" in our spacetime domain and frame of reference, would appear instantaneous as actions would propagate instantly as it would appear to us and timeless intrinsically in this underlying vacuum space superluminous energy state connecting all actions and phenomena like a gel. Einstein said that there can be no superluminous energy state but he was referring to our spacetime 3D reality domain. That necessarily does not mean that there can not be an underlying higher energy state to our Universe which is completely invisible to us... well not completely, QE is one hint.

A few questions: What relation does many worlds have to the arrow of time? Can wave functions branch "backward" in time? If not, why is the wave function time asymmetric? Does the present moment have multiple possible pasts? Is entropy related to many worlds in any way? Could many worlds be emergent from a more fundamental law of the universe, such as for example, "all things that can exist do" and the branching then happens when different logically consistent possible realities can no longer logically exist together anymore? Could the laws of physics as we observe them be the original branches of the universe? Could other branches have other laws of physics or different values for universal constants? Also, thanks so much for making these videos! I hope you truly understand and internalize the impact they have on the world and especially to your viewers.

@tomhepz

4 жыл бұрын

As for the entropy and the arrow of time, QM has the exact same princple, the worlds decohere, and there are many more decohered states, and so statistically you move to a state of 'lower entropy' but there is a tiny tiny change just as there is with entropy that they will 'recohere' but it's so insignificant that you don't need to worry about it

@dajandroid

4 жыл бұрын

I think that the entropy question with regard to the Everettian interpretation was briefly mentioned in Professor Carroll’s Google lecture but I wonder if he could expand on it here in this “The Biggest Ideas” series?

Also, do you have any thoughts about how the branching to many worlds happens? Does the split happen at light speed or faster (because there is a superposition), or is it futile to think in terms of speed? If there is a superposition that causes the branching doesn't that mean that there is one wave function for the many worlds?

This was so good, thank you Sean. Additionally, I really enjoyed Mindscape episodes with Adam Becker and your solo episode about this very topic, I really liked the idea how space is basically and emergent property - two things being close is defined as being able to entangle with each other. I've bought myself a copy, but haven't got the chance to read it yet. I have two questions about the video: 1) Decoherence. Why don't atoms destabilize? We saw that electron fired into a cloud chamber is behaving pretty classically and not like a blob of uncertainty. You explain it like it's getting entangled with everything around. I like that. But how come the electrons in atoms don't de-cohere when every other atom from vicinity is bouncing into them? As we've seen in the previous lecture, the work of Planck-Bohr-de Broglie-Schrödinger explained the electron in an atom needs to be quantum and classical particle just doesn't work. 2) There're projects of 'quantum reconstruction.' Mathematically minded people are trying to rediscover quantum mechanics from simple foundations and derive it mathematically. This is because some people are uneasy because Planck, Heisenberg, Schrödinger and others basically just guessed it. Some of these are based on quantum thermodynamics or quantum information theory. Are these approaches compatible with many worlds?

Dang! I thought I understood Sean's answer to the question in the last video of "What is waving in the wave function?" until this video came and shattered that perception. I thought he was talking about spacetime, but now I see he wasn't. It goes deeper than that. Incredibly fascinating stuff, but I am continually cursing the limits of my intellect. I know I wont' ever fully comprehend these concepts, but the challenge is great fun. Keep 'em coming, Sean.

Hi Sean, thanks so much for this video series! Was watching a video on Many Worlds by Sabine (yes, I'm sorry :-)), and she suggested that many worlds doesn't solve the measurement problem. Now, instead of collapsing the wave function, you branch it - but you can't say when exactly it will branch. Is it when a measurement is done, or...?

The book you mentioned, "What is Real", is an amazing read that covers the history of QM interpretations and the measurement problem. It's a must read for anyone fascinated about the story of Quantum Mechanics and all of the controversy surrounding it.

Feynman, Susskind, Carroll ... three great explainers, but with very different styles and emphases. I can’t say which is more influential, but I am so glad that Sean has decided that this is a good use of his time. For me, these talks are very accessible.

@veronicanoordzee6440

2 жыл бұрын

Susskind, the cookies-munster?

Entanglement: one of those words whose meaning changes as the year passes. Like iconic. I am old enough to remember when it involved splitting a quantum particle in two, consigning each of the halves to opposite sides of the universe, then tapping one to make the other jump simultaneously. The logistics of such an experiment were always rather fascinating, I thought. But then I can remember when an icon was a small painting on wood of a Christian subject created in the Byzantine era of the Roman Empire in Constantinople Ah me, those were the days

Hi Sean, what an amazing series! When I think about the reality through quantum physics eyes, and wonder how nature works, I was compelled by Many Worlds from the begining, though not sure about it, because I felt it is somehow wastefull, by splitting the universe with each interaction. Thanks to you, and your series, I have gained knowledge, in understanding QM as well as Many Worlds in the way I see it through different perspective now, and I like it even better. Always appreciate your lectures and appearances (WSF). Question about topic at hand. Decoherence seems to me like pretty strait concept and I wonder why it had appeared so long after concieving Quantum theory, why Shrodinger and others haven't thought about it? Regards to you, Sir and your very familiar cat in our branch of the wave function of our Universe bouble.

The real “Mr. Universe”! Just awesome! Thank you for this video (too) Mr. Carroll! Me: never stop learning just sometimes “sleep a bit longer”! 😉

Hello and thanks for these fantastic vides. However could you explain spin in maybe a future video? It's my understanding that particles don't actually spin but the term refers to a form of angular momentum without rotation? Does that sound right?

Fun times to be so entangled with KZread.

Thank you for the Biggest Ideas. I was late with my question from the last video so I'm reposting it here. Why do we pose that the observables such as electrons or photons are acting like a wave but then a particle with the collapse of a wave function instead of posing that the electrons or photons act/are like particles interacting in a 'wavey' like background medium or some extra dimension(s) that force corpuscles into appearing to have interference? Alternately asked, is there a reason to believe that space-time could not be causing the interference patterns observed in the double slit experiment? Thanks

The perfect duet - Sean Carroll with The Biggest Ideas and Brian Greene with Your daily equation. I could hear and learn from them all day long.

@stephenkamenar

4 жыл бұрын

i sometimes get those 2 guys mixed up

Very good material in Physics.

Live Forever and Prosper, Sean Carroll. Live Forever Young and Prosper, Sean Carroll.

Professor Carroll, could you explain what is going on after the measurement with, say, a particle and its wave function? When we see "collapsed" wavefunction giving us the position, does it somehow "recombines" from this definite "peaked" value to fuzzy wavefunction again? When and how it is done and how does it look like in all of those theories (or interpretations) you mentioned?

Question, how is the spin example any different from like, if i had a box with a red ball and a black ball and i gave one to Alice and one to Bob and then sent Bob to Alpha Centauri without either of them looking at what color they had, now when i see that Alice has the red ball for example, that tells me instantly that bob has the black one, but that doesnt mean that theres spooky action, it just tells me that i didnt have the knowledge of the initial state. so for me the issue then becomes similar to laplace's deamon or am i missing something obvious? (other than like there is no actual 'color of the balls' in quantum physics because by assigning the probabilities we ourselves state a correlation which we are surprised by when it comes true)

Questions: - 1. In the spin example, can the wave function be of the form: 1/sqrt(3) [ (up,up) (down,down) (up,down) ] - in that case if A measures up, the measurement of B is not immediately determined - is this also an entangled system then ? 2. It seems that the concept of many worlds comes out as a result of Everett's 2 postulates. However, is it possible to design an experiment to test the concept of many worlds ? 3. A request: would you please re-do the double-slit experiment explanation from the point of view of many worlds rather than Copenhagen

@arpansircar8858

4 жыл бұрын

2) Yeah I think he may have said something like that 3) As far as I can recall, in PBS Space Time they used the Copenhagen explanation, I can re-check. Do let me know if you have any link to a video which explains the Double Slit using Many-Worlds

@JohnDlugosz

4 жыл бұрын

@@chriswarburton4296 *affects

purple background is awesome... color works for ya...!!!!

Thx, Professor Carrol, would you compare Everett's not ignoring the 'did not happen' portion of the wave function after collapse similar to Dirac's second solution to the electron which was ultimately discovered (positron)?

This is what went through my head following your interesting lecture: Isn't the Schrödinger cat problematic just a consequence of our thinking in categories, which we turn in a slight of hand into discrete states of nature? It reminds very much of the cow as a point mass. I have never seen a cat that is in the state of being asleep, or in the state of hunting mice (but I have seen a cat sleeping and possibly dreaming about hunting mice). This whole idea of physical state is great, especially when you can assess it quantitatively and make predictions about it, but for almost everything else of greater complexity it remains just an empty abstraction. How many possible states has a large molecule made up of 10,000 atoms? How many states has your brain with all its10^11 neurons, each one of which being as complex as a little universe? And, since you mention of course the Schrödinger equation of which that monstrosity is supposed to be a solution, one might challenge you to write down the Hamiltonian for that :-) The "solution" of integrating the cat, the entire apparatus, and the observer (with brain and guts and laptop) into one grand wave function seems attractive on first glance, but it is still an unbelievably great leap of faith to generalize from an entangled state of a few atoms (or even a million atoms) to "the Psi function of the universe". Some religious person might ask - does it include God? How far have we really moved away from trying to answer the question how many angels fit on a needle tip?

Amazingly bright

Are you able to start from wave functions and describe a classical process like two particles bumping into each other and scattering in different directions?

Sean, thanks for putting out these amazing lectures. You are an incredible teacher! I honestly feel that these videos have much more utility than all the nonsensical and pseudo-sophisticated "Theory of Everything" garbage being propagated by certain individuals (e.g. Weinstein and Wolfram) who are not even directly involved with the established physics community. Kudos to your efforts! I'll be looking for your undergrad QM textbook when it comes out.

@jonathansharir-smith6683

4 жыл бұрын

Is he actually working on an undergrad QM textbook? Asking because I have no doubt that would be an amazingly lucid intro to a difficult subject. Maybe he can answer on his next Q&A!

@jonathansharir-smith6683

4 жыл бұрын

Aaaaand lo and behold, 3 minutes in he answers my question. Looking forward to it.

@FreekaPista

4 жыл бұрын

I think what Wolfram and Weinstein are doing is still massively important to the physics community, but their efforts are *very* niche in application. We are at a point where string theory isn't able to be confirmed experimentally (yet) so having some other theories is definitely beneficial in case string theory doesn't pan out. But those new theories really aren't relevant yet either, especially not to those without a career in physics that can make sense of their arguments and mathematics. An overabundance of ideas is never a problem in science, but if understanding Quantum theories is just a hobby for you, it's worth cutting out most of the noise until scientists can reach a new consensus (or at least start moving towards one).

@dustinirwin1

4 жыл бұрын

@@nihlify True, but these vids are based in what we know of the universe and our theories of the implications of this knowledge. Weinstein is talking about rulers and protractors in a way that I find to be completely incoherent. His "hidden knowledge" that he's been afraid to reveal for the trauma it might bring us. OK fine. But perhaps he could discuss with an educated peer who has the knowledge to at least work through what he's trying to say and challenge him in the foundational ideas.

@evanbauer2590

4 жыл бұрын

@@dustinirwin1 Weinstien is talking nonsense clearly. A decent analogy would be Jay-z and Nas (just because he wear a kufi doesn't mean that he bright.) He uses big words and obfuscates the point. He is the type of person who seems smart to dumb people.

Question: Is it possible to continuously measure both entangled particles without break the entanglement? Also is it possible while this is occurring to manipulate one particle's Spin or Charge there by observing the instantaneous change in the other particle?

This all makes perfect sense for simple entanglement like spin-up and spin-down, but I still just can't wrap my head around position entanglement. Wouldn't the universe split infinitely often for every different position that an electron could be in, for example?

Thanks, Sean!

What if there's a hidden dimension where entangled particles are still adjacent even when they are far apart in 3D space?

Sean, thank you for making this complicated topic so easy to understand conceptually. Even though the maths is above my head. I do have a question about the future of Quantum Mechanics. I would like to know "what's next" in a few areas, namely: - What's next if something like QBism is experimentally proven or many worlds falsified - Can you imagine any other new interpretations that have no theories, just speculative as to what the bounds are of what it could all mean - what are practical applications of understanding this more or is that unimaginable until it is understood more? And what is day to day life like as a physicist in lunch room talk on these topics? e.g. I'm a programmer and we get into debates about languages, libraries, programming techniques etc. Do you and your colleagues discuss it much or is this a taboo topic?

Dear Professor Carroll Many thanks indeed for your very clear explanation. One particular puzzle stood out for me, though. You point out (at about 21:03) that in the wavefunction Psi [2] measurement the result of Alice finding her particle having spin up is that she instantly knows that Bob's will also be spin up too. You then go on to say that in a variation of the measurement, wavefunction Psi [3], particles can be anti-correlated, so that when Alice measures her particle to be spin up, Bob will measure his to be spin down. How are Alice and Bob able tell which of the two types of wavefunction they're dealing with? I suppose they must have some way of telling otherwise neither Alice nor Bob can have any knowledge of the other's particle. Does this mean, then, that it's possible for the two wavefunctions Psi [2] and Psi [3] to be set up in advance to be either correlated or uncorrelated, thus having some control of the outcome of the measurement?

Hello, Sean! Watching your videos has actually given me a pretty good picture of the current state of affairs, and I appreciate this immensely, being a total layman in physics. I have this question: if the Wave function is not only a tool to make predictions, but is instead something real, how do you even start studying it? Who sets its values? I'm a bit lost, I can't really formulate my question right, but the reality or unreality of the wave function stops me from even thinking about it. Help!

Great series

Let a thousand flowers 🌺 bloom across the multiverse of speculative ideas.

I was wondering if you could give the Sean Carroll treatment to the Heisenberg picture vs the Schroedinger picture? The seem pretty relevant in the quest to find the “correct” perspective on quantum mechanics. Do you think one of the pictures looks at things the way things are “really going on” better than the other?

Question: So an electron can be in super position, spin up in 1 world and spin down in another world. Does it travel between the worlds? Or is it always spin up in 1 world and vice versa. There is already existing infinte worlds or does it create more worlds.

I am a simple man. I see Sean Carroll channel. I subscribe.

7:00. When two 'waves' meet, my sense is that they disturb one another at the moment of 'impact' but then move on through undisturbed. (This is what I teach my A-level students about superposition.) So could you please tell us in the QnA session: Why is this different with the wave function? Why do we get this 'spherical resultant wavefunction'. What is it about the wavefunction that makes it NOT like an emag wave for example...

@kindlin

4 жыл бұрын

I think it's just because these are not just waves, but particles that interact. If you take two photons, they can pass right through each other and emerge unchanged at the other end of the 'collision,' but if you take a photon and electron, or any other pair of particles that interact with each other, when they are 'close enough' they pass information back and forth and scatter, or annihilate, or what have you.

Is every interaction phenomenon a change of entanglement, and does the uncertainty principle come from having to entangle your quantum states with the experiment?