Episode 45: Leonard Susskind on Quantum Information, Quantum Gravity, and Holography 

Sean Carroll and Lenny Susskind... awesome :)

i think that i'm supposed to be here right now , listening to this whole conversation while i'm working in the studio today 🧬

Leonard Susskind one of the most brilliant scientists of our generation; also sounds like he could beat the shit out of you in a bar fight lol

"Your optimistic, I'm 78." Hilarious

Lenny Susskind is a delight! Thank you for having him on the Mindscape Podcast!!!

I'm a simple man. I see Susskind in the title and I click instantly.

Have never clicked so fast in my life!

I idolize Leonard Susskind, I've read and watched just about everything I can find that's been published by him. His fascinating YT lectures introduced me to science and they led me to seek further education. He's one of science's greatest minds.

Leonard Susskind is a living legend

I rarely give instant likes on YT videos, but this one required it

I highly recommend watching his theoretical minimum lecture videos on RU-vid. He explains many key equations and proofs without getting too deep into the weeds. He’s such a great lecturer.

59:24 "And the other thing that makes you think you're on the right track, is when something that you've been thinking about, turns out the same mathematics, the same sets of principles, turn up in another area..." awesome to hear stuff like that from one of the great theoretical minds I've had the pleasure of listening to. Thanks Drs. Carroll and Susskind,!

Dear Dr. Susskind, the story about your father at the end was very touching to me personally because you have become a teacher of mine as well. Thank you.

I am ridiculously excited about this one :)

So, great. Even though I've spent several hours listening to both of these guys talking before, I now understand the Holography better from this than I ever had before.

i love listening to this even tho i dont understand anyting thanks sean love u

What I like about him is that he always proceeds with caution with what he says,, Even in response to some of Sean's comments, Because he values very much the meaning and power of every single word, And that is because the only way to truly understand every concept and make real progress with a theory is to be very very clear about the type of questions you ask and the framework your start from

I've listened to all your podcasts, I'm addicted to your voice and knowledge. Thank you 🖤

This conversation was really very illuminating. Thank you Sean.

Immense thanks for having on the brilliant and wonderful Leonard Susskind!

thank you so much i've been waiting for this so long

I like listening to geniuses. There's no flim flam and waffle. Just pure thoughts.

Thoroughly enjoyable - an hour too short! Huge thanks to Lenny and Sean for another great podcast. 😎

So glad you made this episode! Thanks! :)

Seeing the title of this episode was like Christmas morning as a little kid. My two favorite people to listen to on the same podcast? The only thing I wish they had discussed in more detail is the ER = EPR idea

GREAT pod cast..! Several of my favorite subjects of science

As a computer science student and physics enthusiast i think the collaboration of both fields is amazing as was stated here , Awesome podcasts ! :)

Omg I have not even watched and I know this is going to be great!

Great way to start my work day listening to these two brains.

Yes! Figured/hoped you'd get around to having Susskind on the podcast!

Haven't listened to, but already liked. Kudos for inviting a legend.

Just discovered this podcast from RU-vid recommended. Now I have 45 episodes of science podcasts to listen to 😀

I can only wish this chat had gone for another hour at least, always a pleasure to listen to Leonard.

I enjoy listening to both of you. Listening to Susskind is like my Morgan Freeman. I hope one day I can continue my physics degree. I majored in physics in college but college became too pricey.

Great guest and an interesting talk, thank you Sean.

Me too. I was waiting to hear the latest Leonard's thinking about recent findngs and the future of probing string theory and holografic principle.

This episode is absolute gold

Just bought your book *spacetime and geometry, an introduction to general relativity* Can’t wait for it to arrive in the mail!!

OMG He did it! He really did it! Thanks so much for this!

Profound bedtime stories, listening to these mind bending nightmare inducing discussions, through real headphones in the dark.

physicist and fan of Susskind for ~ 30 years, what great fun!

Absolutely phenomenal exchange between two of the smartest, respected and cutting edge theorists of our species

Brilliant, lets get the snacks and coffee ready. This should be awesome.

It was delightful listening to this podcast

Cool fact...Sean actually played the intro live with Lenny on base

The most awaiting one ....!

Superb thank you Sean and Lenny.

Thanks Sean & Lenny!

Hi Sean, I really enjoy your podcast! Keep up the good work! Have you ever considered talking with Max Tegmark about his idea of the "Mathematical universe"?

Very nice discussion. Stimulating !

Wonderful. Thank you.

I think we can all thank lenny for doing what he's doing, I myself am a computer science student and this type of talk is amazing I never thought about learning such things in a field that distant of mine (I figured out not that distant actually lol)

Fascinating conversation!!!!

I'm putting my headphones on for this one 😎

great guest thank you

Dream big like these two and share your crackpot thoughts, because the next Sean and Lenny are already out there thinking deeply and trying to make sense of the world. Best possible interview on the subject IMHO!

This deserves billions of more likes

Awesome. Two of my favorites.

Great job Sean

I have never had an hour go by so fast

Nice recommendation 4 years later. Good talk. now have to check the latest..

Cool... Sean inviting some Tim Morton ideas into the convo... i love when physicist bring up philosophers and vice versa

I love listening to Leonard Susskind he is very direct and clear with how he presents things. But the main thing I love about him is his ideas because I am working on something which focuses on the topic of quantum information and black holes. I found an equation which shows how surface area entropy can be used to conserve information about different quantum properties of electrons in atoms as body of mass collapses to a black hole. If anyone wants to hear about it and discuss please feel free to watch the videos on my channel.

In anticipation of the Scott Aaronson interview, see the article by Ben Lindbergh, in The Ringer, where he discuss time travel in the Avengers:Endgame, and he interviews Aaronson referring to Aaronson, as today's Tony Stark, even though Aaronson has yet to see the movie.

I wish the two of you would address Roger Penrose's CCC. Seriously.

Sean, my hypothesis that Dark Matter is not a WIMP, but maybe is a deformation of space-time by which the curvature of space-time ALONE is the cause of the gravitational effect. Gravity is the consequence of the curvature of space-time. It may be possible that the structure of space-time itself could be warped without the presence of mass. Space-time has been shown to react like a fabric by warping, twisting, and propagating independent of mass. These properties have been proven with observations of gravitational lensing, frame dragging, and now gravitational waves. Fabrics can be stretched, pressured, and/or heated to the point of deformation. Such extreme conditions were all present during inflation, so it is plausible that space-time’s elastic nature could have hit its yield point and permanently deformed. Therefore, if gravity is the consequence of the warping of space-time, and fabrics can be permanently deformed, then a deformation could create a gravitational effect independent of mass. Thus, the unidentified dark "matter" that seems to be so elusive to modern science may not be matter at all but merely warped deformities causing gravitational effects. DM could be a microscopic black hole with no mass at the center... Prediction: Spacetime's elastic property hits a yield point, so only that part of geodesic's "stretch marks" would remain after inflation stopped. These steep gravitational wells would not follow the inverse square law. Any thoughts?

Great podcast, abrupt ending 😆 "okay gotta go!"

Have always wanted to ask Sean why there has been such a great deal of resistance from physicists to write technical books for a public audience. Lenny really has pushed the envelope in this regard and has largely been a sole outlier.

This is such a treat

This is awesome ...

Just started listening, already know this is historical

two brilliants I admire!

2 genius personalities coming together for our beautiful entertainment and learning Pure

Wish there was video for this as well

I respect all the scientists but being a retired editorial cartoonist I am more monkey than human. Your honesty with humor is what I need the most.

Love these videos.

The content was very good, but as I always say, you have to get a volume compressor in order for the audio to be good.

somewhat late on checking this out but simply brilliant

He is truly Leonard

Great video!

Richard Feynman & Leonard Susskind would have been hilarious to hang around. Can you imagine those 2, just chilling together? Ah haha 😄.

Missed asking Roger Penrose about information being lost. Too bad. Hope you get Lee Smolin or someone from Perimeter Institute. Would be nice to hear some deeper critique of Inflation and Quantum Mechanics.

17:00 How can you jump inside event horizon and leave? What does "jump in" mean? Something else?

Can you use quantum entanglement to create instant communications (ftl) between vast distances as long as the 2 communication stations start out together?

omg SO EXCITED!!!!!!!!

instant click and like ..this is like the main billing ..

Sean, can you try to get Nima Arkani-Hamed on? If I recall correctly, you two disagree on whether particles are point-like or waves. It would be interesting to hear you discuss this on the podcast. Thanks!

Have you ever had David Gelernter on? I am sure you could come up with a topic. Great show btw.

Thank you so much for this.

22:00 100% agree. But what do I know?

One has to bare in mind, regardless of derivatives sciences, that fundamentally the models we use are just that 'individual pictures,' and not to be misconstrued of evidence of what the universe really is outside of these pictures. Art, in this sense, precedes math and not vice versa.

Qubits may not increase switching capacity at all. Signal manipulation in weak nucleus on the other hand offers much faster information transfer.

Great scott!

Wow, just wow.

I wonder about quantum information loss when merging black holes partially evaporate due to gravity waves?

so awesome!

Loved it

ZOMG Best guest ever. First of a series? We need a Many Worlds vs. Hologram deathmatch, please. An hour of "WHO DO YOU THINK YOU ARE TO SIT AT THAT DESK? I KNEW THAT MAN!" from Dr. Susskind would be 12 kinds of awesome.

Ok, last one:-) I envision space/time (I lean toward them being less intimately connected) "tipping" from more space, to more time as I cross the eh. The "closer" I come to the singularity, the more time dominates space. What else works this way? Gravity. I think I could substitute the word G for T, without changing my view.

Could you use a wormhole to travel at the speed of light?