PSW 2384 The Doom of Space Time: Why It Must Dissolve Into More Fundamental Structures|Arkani-Hamed

Lecture Starts at: 14:20
Friday, December 1, 2017
Space-time and Quantum Mechanics are the pillars of our modern understanding of fundamental physics. However, there are storm clouds on the horizon indicating that these principles are approximate and must be replaced with something deeper. The union of quantum mechanics and gravity strongly suggests that "space-time is doomed".
Abstract: www.philsoc.org/2017Fall/2384a...

[@mikeschatz9153]

I have watched this video many times. Tonight is the first time I think I understand everything he is saying. Today is a great day for me.

[@veo_]

This is a fascinating lecture. The concepts are clear enough, but the thing that caused me to pause the video and comment is Dr. Nima Arkani-Hamed's projected slide-deck (I'm assuming) handwritten script! I'm a student of typography, and It's the most beautiful retro-futuristic, Jetson's type handwriting I've ever seen. I was digging on all the dramatic caps and the tall, isolated, piercing "t"'s standing guard over tiny x-height subcaps. But when he wrote "of" with the "o" on the baseline, but the majority of the "f" ascender below baseline, I absolutely swooned! Such a riveting lecturer AND such style!

[@stevebethhayward858]

I was so bummed out when nobody laughed at his jokes when he was doing the introduction. "Accounting" ha! They were funny jokes people should have laughed! 🤣💕

[@danerman73]

The 2nd half of the lecture is fascinating. The simplification of the quantum mechanic diagram for particles that does away with virtual particles giving the right results is very promising. Would love to see where this leads.

[@shirleymason7697]

Love Nima. I’m not a scientist but always get something from listening to Dr. Armani-Hamed, a fascinating thinker. Even learning what I don’t know and cannot really comprehend, is learning.

[@brendawilliams8062]

He is an excellent Educator.

[@jorisboulet3619]

Mr Arkani-Hamed lectures are always fascinating.

[@EricLehner]

Hello from Canada. Thank you for facilitating meaningful enquiry into matters that should be of interest to an informed public. All the best.

[@theultimatereductionist7592]

Dr Nima Arkani-Hamed is INSANELY fascinating.

[@veritas41photo]

The documentary "Particle Fever" features Dr Nima Arkani-Hamed very heavily. It is a great view. I recommend it highly to all. You can see its DVD cover on the lectern during the intro!

[@iteerrex8166]

Thank you PSW for your KZbin channel, Im glad i found it. A very especial thanks to Prof. Nima Arkani Hamed for the wonderful talk. The 2 hrs felt like 20 mins :)

[@bertmollar]

I would love to be a fly on the wall when Nima and Lee Smolin are talking about the future of quantum mechanics.

[@TheYourbox]

Nima's passion to tell such incredible things is fascinating.

[@vincentpertoso3148]

Very good lecture. It seems that we are at a limit of what can be directly observed experimentally at the quantum level when it takes an infinitely large apparatus to measure activity occurring in an infinitely small volume of the universe.

[@stoneysdead689]

As far as directly observing deeper more fundamental phenomenon- you're right. Many quantum scientists have said it's like nature is protecting her secrets, she set the rules so that it made it impossible for us to see and thus understand. That said- that doesn't mean quantum experimentation is over or useless- far from it. For one we find more practical uses for different facets of the theory every day so there's that- and, even if we can't observe directly, we can often infer things based on what we do observe directly so- they're still plugging away at it.

[@robbie_]

Oh, a new(ish) Nima Arkani-Hamed lecture. Thanks.

[@lenyabloko]

Enjoyed the talk very much. Wish I could ask questions about some things I did not understand.

[@nicholastaylor9398]

Wouldn't the Planck scale black hole evaporate almost immediately, and in less time than the Planck time? I suppose then that energy could at least not become indefinitely concentrated.

[@stevebethhayward858]

I don't know if it's true that you need an LHC.... I don't think you need larger distances but you need greater speed I think that can be accomplished in other ways no? I'm just a lay person/householder who studies this as a hobby I truly enjoy your lectures thank you so much! 🙏

[@paolobarberis6827]

Nima Arkani-Hamed for president, that would change the world...

[@DoctorCalabria]

Wish I could give 2 thumbs up! Great lecture.

[@harihar5767]

Oh that is mind blowing amazing to comprehend .Thats really above all fascination thanks a lot for this lecture sir

[@KhodabakhshHessamiPilehrood]

Thank you for posting such an amazing lecture.

[@BananaPringle]

Is Space Time Doomed or is it a measurement issue? If we are having difficulty measuring something does that mean we discard it?

[@andrewferg8737]

These are levels of abstraction. Deepening one's understanding does not necessarily require discarding previous models. Newton remains relevant despite Einstein. Einstein remains relevant despite Feynman... etc.

[@deeplearningpartnership]

Nice lecture.

[@elizondorj]

Excellent talk and very interesting discussion.

[@friggindoc]

Stephen Wolfram has a nice framework that could perhaps prove useful. Time-dilation and Uncertainty seem to be related in that theory...

[@midnightantelopes]

Amazing talk through and through.

[@PhilosopherRex]

Fascinating talk. Thanks!

[@climbeverest]

Fascinating

[@AJyogi108]

this is so fascinating

[@adelvoid1530]

Great talk like always with Nima.

[@JP-re3bc]

Awesome.

[@holymoly2353]

Really good talk - best in a long time!

[@lacyhart2043]

So cool love this

[@mal2ksc]

I thought physicists were fond of spherical cows and frictionless surfaces, and that it was cats that love boxes.

[@HeronMarkBlade]

Fantastic, came here owing to Donald Hoffman's references to amplituhedra. Spooky stuff.

[@jimtaggert42]

thanks

[@akumar7366]

Brilliant.

[@Moronvideos1940]

I downloaded this Thank you

[@lacyhart2043]

This guy is a badass.

[@solowinterwolf]

Holy cow!

[@dimitrispapadimitriou5622]

Our universe has a positive cosmological constant, so, in the far future it will be almost empty deSitter with a very low but finite temperature. Now , the problem is that this temperature, which is associated with the area of the cosmic horizon cannot be measured by any means, even in principle. There is nothing in a deSitter vacuum to act as a detector, and ,moreover, if it was, it would have been so huge ( the wavelengths are comparable with the radius of the horizon itself ) so that the geometry won't be deSitter anymore! Does that mean that the the Gibbons / Hawking temperature / entropy ( and the generalized second law) are meaningless for cosmology? Also, the final stage of the evaporation of a black hole - the burst of radiation that's emitted when the tiny horizon dissapears ( according to the most popular expectation)- that leaves, supposedly, flat space in the end, does not count as a " probe" for arbitrarily small distances?

[@viewer3091]

The Universe seems to go for Efficiency perhaps even a Beautiful Efficiency !

[@wheredmyelectrongo3613]

Nima is certainly brilliant and creative, but how can space time be doomed if it's replaced by geometric based mathematics. The fundamental Machinery of geometry deals with relationships between shapes, and angles which only exist in some kind of space.

[@JP-re3bc]

Awesome.