Видео

Whole concept of black hole is nothing but a science fiction.

33:36 axion is not part of DM

Fascinating. Where are we now 3 years later? Just curious

Trying to understand it, inspiration for me :)

10:59

Great lecture, but what’s going on in the background.

Sabrina is amazing !

Thank you, ICTS, for the invitation. It was a great opportunity for me to present my work in detail in the presence of experts. My RUclips channel: ruclips.net/channel/UChPyufxI-GPFpNlrFloXrWQ

ruclips.net/video/DDyKGOyIYJ0/видео.html

Fascinating! Please post more!

Good lecture!

Good talk!

Good talk

As usual, Ed Witten is so smart that I cannot understand a single sentence that he is conveying here. However the inverse may also be true, that I am so dumb :-).

Good talk!

Great work ,congratulations. I done some simulations of black hole formation and also some string related subjects. You may find it interesting ruclips.net/video/5jSqVrWJgLQ/видео.html

Good lecture!

Re: ensemble averages @1:26:00 (and elsewhere) ... aren't we all missing the whole point of these toy models? QM is _always_ a type of ensemble average, that is what sum-over-histories is saying. So in your bulk gravity side you are missing this, and only picking it up on the boundary CFT theory side. What corrects gravity is the deep Planck scale structure, which everyone agrees has to be a spacetime foam, but all that describes is something akin to a wormhole gas, and that is CTC galore, and that is what gives you the complexity missing in the naive bulk gravity calculation in these toy models which do not have spacetime foam. Gravity actually gives you the _effective_ ensemble averaging, we just ignore it because no one is taking into account the effects of the CTCs, no one wants to. Remember, if you have a region containing CTCs then your cobordism is essentially a quantum computer, but totally classical other than the wormhole topology. It is basically an impossible calculation, but not hard to "see" (intuitively) that _if_ you accounted for Planck scale CTC's then you would probably get precise duality (well, maybe, that's just my conjecture), and bulk gravity is then precisely mapping onto your CFT. Gravity was quantum mechanical all along, you do not need to quantize it, and the way forward now is to make something concrete from this intuition.

nerd

Good talk

Good talk, Subir sir is knowledgeable.

Good talk, I attended this live!

Thanks for sharing. Very good talk by Sudarshan sir. -Abhijeet PG student.

Thanks for sharing the lecture. Great talk by Nikhil. -Abhijeet Post Graduate student from India.

Good talk, attended it live on zoom!

Thanks for sharing the talk!

Good topic of discussions. Thanks for sharing the lecture. I am able to join some lecture via zoom as well. Post graduate student in A&A, RS, ML and ACT.

great vid, mate!

He may win a Nobel some day

Amazing talk, and good explanation of the island formula.

I got the email that the seminar will start at 7.30pm....i guess they mistakenly changed it...i missed it... anyways great seminar.... congratulations

Thanks for sharing such talks. I am have been interested in this topic since 2016.

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Raghu mahajan is basically god on earth.

I am very thankful to ICTS for organising many such good seminars and to Professor Netta Engelhardt for a very nice Talk. I had a small query around 31:30 regarding analytic continuation of annealed free energy near m=0. I don't know why it is difficult to analytically continue near m=0. I will be very thankful to receive some answer regarding the same. Also I don't have an intuition as to why higher genus topologies (which require non perturbrative physics) at lower temperature. Thanking you, Yours sincerely, Shreyansh

Is g in the interface Entropy number of degenerate states that CFT can be . Does g Probably suggest all possible degenerate states at the interface with same energy of the system? I just wanted to know about g. Thanking you, Yours sincerely, Shreyansh

I am very thankful to Professor Mark Van Ramsdonck for his very good lecture and also to Icts for organising many good talks🙂🙏🙏. I have a small question around 40:09 are we assuming Cft's in large N limit so that the dual geometry is Einstein gravity?🙂🙏🙏 Thanking everyone, Yours sincerely, Shreyansh

The Weyl trumpet

I have another question around 1:05:59 . Isn't S (Black Hole Entropy) changing as a function of time since the system contains a bath. So e^-S is entropy at some time? 🙂🙏🙏 Thank you 🙂🙏🙏

I had a small query around 1:05:17 .Can't there be other sub leading terms in the inner product along with e^-s . Meaning I am confused with how we know that all off diagonal terms are exponentially small. The non perturbrative terms in replica trick fix information paradox but we don't know that these can be the only terms until we have a more complete theory of gravity 🙂🙏🙏.

39:29 it appears a very good question just wondering can the idea be an alternative to Ensemble interpretation 😅? Thank you 🙂🙏🙏

In the bulk space-time does it imply that the interior of Wormhole is growing in length( the idea proposed by Professor Leonard Susskind and others🙂🙏🙏) . Is it that the spectrum of Ensemble of Hamiltonian growing in complexity with time?🙂🙏🙏 Thank you 🙂🙏🙏

I had a small doubt around 30:42 , I don't know why the spectral form factor is growing linearly. Thank you 🙂🙏🙏.

43:25 another very good question 🙂🙏🙏.

42:06 it is a very good point 🙂🙏🙏 by Suvrat Sir.

I am very thankful to Icts and Tifr for organising very nice talks which helps us to understand something about recent work going in Black Hole Information paradox. I am obliged to Douglas Stanford for giving this and many other nice talks which have helped me a lot to understand recent work going in. He explains things in a very simple and clear way. The audience in the talk make it very interactive and interesting. There are number of things I need to go through before getting content to good extent. Hope these video lectures will be very useful to many of us. 🙂🙏🙏 Yours respectfully, Shreyansh