Excelent episode, i'll love a second part of this disscution. Thank you, Sean!
@michaeljfigueroa2 жыл бұрын
Maybe if we ask on Patreon.....!!!
@Ava314152 жыл бұрын
59 years ago, I gave up physics because I could imagine ADS/DS driving me down an insane rabbit hole, but this was fun! Thanks, listened though 3 times, and want to many times more, Can I suggest plugging 2 lapel mics into your phone and hit record when you have that coffee
@spaceinyourface2 жыл бұрын
I love all these physics podcast.
@JamieK348Ай бұрын
Sean I love this interview and you do such a good job. Very intuitive questions that made this one of the most intriguing discussions I have heard!
@malinkifox2011 Жыл бұрын
Loved this podcast he uses such simple way of explaining very complex theories
@Life_422 жыл бұрын
I'm so happy to have stumbled upon this channel! Thanks to StarTalk and Closer To Truth!
@ddavidjeremy2 жыл бұрын
If I'm going to get A sufficient understanding of the Holographic Principle someone is gonna have to get out the crayons, write a sing-along and break that thing down "Barney style" for me.
@keatodiet2 жыл бұрын
I loved how sean grew more and more passive aggressive as the show progressed lol
@fmbgcunha2 жыл бұрын
Top episode, one of the best.
@viktorbarkar82282 жыл бұрын
Thank you for your work
@michaeljfigueroa2 жыл бұрын
Thanks. I enjoyed this one a lot!
@gtziavelis2 жыл бұрын
holographic principle: have always found it fascinating that a ONE-dimensional point directly behind a black hole from an observer's viewpoint gets promoted to a TWO-dimensional Einstein ring observation, and have never heard an expert talk about this "dimensional upgrade". that is akin to, or if you're imaginative, something like the opposite of, black hole information being encoded on the surface area rather than in the volume, which, in layman's terms, is like a "dimensional downgrade".
@TheMemesofDestruction2 жыл бұрын
Perhaps it’s computationally reducible? ^.^
@ilikenicethings2 жыл бұрын
Isn’t it because the ring is showing you the same “one dimensional” source as seen from different places in the universe that encircle the distorting mass from your perspective?
@Littleprinceleon2 жыл бұрын
A link to any video on this Einstein ring? Thanks
@simesaid2 жыл бұрын
To start with, nothing that you've mentioned has anything to do with the holographic principle, or to Hawking radiation either. Second, Einstein rings are created when the light from an entire galaxy is 'bent' around another galaxy that sits between us and the one further away. Now, most, if not all, galaxies (including the Milky Way's) _do_ happen to have a supermassive black hole at their centre, but Einstein rings are purely gravitational in nature and black holes aren't strictly needed for them to be created - any sufficiently massive object (or collection of objects) will do. Lastly, there is no "dimensional upgrade". There is 2D light coming from a distant galaxy, and you see a 2D Einstein ring as that lights trajectory (travelling on geodesic 'straight lines') is 'bent' around a closer galaxy. There is no 1D. Electrons are described in physics as being _point_ particles - and points _are_ 1D, but that's about the only time you'll ever hear about 1D objects. We live in a 3D universe, and thus everything we can see is 2D, even if something _looks_ 1D, upon closer examination it will turn out to actually be 2D. Hope that helps a bit. Einstein rings are actually pretty cool, because the phenomena allows us to see _very_ old galaxies that are _very_ far away and that would ordinarily be invisible to us as they lie behind other galaxy structures! Good luck with your physics journey, have a great day!
@hugegamer59889 ай бұрын
@@simesaid point particles aren’t even strictly points. Beneath the plank length size loses meaning as we know it. Further, with the probability of interaction being a cloud in quantum mechanics explicit classical size as we know it does not exist.
@dimitrispapadimitriou56222 жыл бұрын
Quite recently ( a couple of months ago), a new preprint from Robert Wald , D. Danielson, G. Satishchandran introduced a new interesting twist that has to do with the black hole information problem. According to this paper, black holes decohere even quantum superpositions of stuff that remains outside the horizon ( for example in orbit around the hole). The implication is that , eventually, black holes ( and perhaps more generally causal horizons ) have the potential to fundamentally decohere almost every quantum superposition in the universe...
@bjpafa22932 жыл бұрын
"... almost every superposition..." is too vague, non even fitting the analogy minimum definition as a figure of style... But, OK, we should be able to answer after reading the paper... 👌
@marishkagrayson Жыл бұрын
Yes, the black holes have been described as “eyes” that decohere all states. I prefer to see the black holes as buttons that hold together (stitched up) “reality”.😅
@elwood.downey2 жыл бұрын
Best episode yet.
@SubstanceP8882 жыл бұрын
Debatable.
@elwood.downey2 жыл бұрын
@@SubstanceP888 Sure, it depends on why one is here. I'm here as an adjunct to Dr Carroll's Biggest Ideas in the Universe series. The premise there was to pull no punches and talk real physics. But some time ago Dr Carroll wandered off more often into the softer sciences in which I have no interest. That's when I pulled my Patreon support. So I'm always glad when at least this youtube series gets back on track for me.
@JasonWalsh-b4n9 ай бұрын
WHAT EXACTLY IS AN ERGOSPHERE?
@kquat78992 жыл бұрын
Looking forward to this!
@erichodge567 Жыл бұрын
You know...I won't even pretend to understand one ten thousandth of what is being discussed here, but still I listened entranced for an hour and a half. This is what it must have sounded like when Bohr and Einstein were having their famous arguments, or when Richard Feynman and John Wheeler were hashing it out. Honest, informed debate. What a far cry from our politics at the moment...
@skydweller20492 жыл бұрын
What does it mean to have quantum states? as in the black hole has a certain amount of quantum states to it.
@bendavis22342 жыл бұрын
When he said that “physics doesn’t concern itself with the question of what is real” I’m can feel Sean holding back on his opinion of the matter.
@Archbishop-Desmond-Tutu2 жыл бұрын
Because that's philosophy. Science is concerned with testing hypothesis via experimentation, that's all
@bendavis22342 жыл бұрын
@@Archbishop-Desmond-Tutu Yep it is philosophy, no doubt. Seeing that Sean now has a chair in philosophy, I'm not sure that he would back away from the question because of that.
@dimitrispapadimitriou56222 жыл бұрын
52:00 The problem is that , generically, there is no way for an external observer to define were the event horizon of a black hole is with any local experiment. Event horizons are global properties of spacetime, you need to know the entire history of the future to decide how big a black hole will be eventually... "Stretched horizons", besides the fact that they're coordinate dependent ( so they don't have any fundamental significance) are also meaningless in realistic situations, for example in the case of merging black holes.
@hugegamer59889 ай бұрын
How local? You can test the local curvature of spacetime, by measuring spaghettification and the ansitropy in the local ambient cosmic microwave background radiation. You can calculate the time to the horizon by the time it takes you to be causally disconnected from the CMB and the mass by the amount of spaghettification with respect to the rate of CMB shift.
@dimitrispapadimitriou56229 ай бұрын
@@hugegamer5988 You forgot that real black holes are not static or stationary. They're growing by consuming stuff/ radiation , they merge with other black holes etc. Their horizons that we observe are "apparent" or dynamical horizons, not the absolute event horizons. So, defining a timelike "stretched horizon", that lies just outside the "global Event horizon" needs knowledge of tne future history of spacetime, generically. Black holes are not isolated, as in theoretical papers, where it is assumed that they're asymptotically stationary...
@hugegamer59889 ай бұрын
@@dimitrispapadimitriou5622 they don’t assume the horizon is asymptotically stationary instead they assume that infalling mass updates the horizon the speed of light causing the surface to ring its measurable during large mergers
@dimitrispapadimitriou56229 ай бұрын
@@hugegamer5988 The whole thing about " black hole complementarity" is based on the concept of the "stretched horizons". As i already said, these notions of "stretched horizons" are basically meaningless when you have e.g. merging black holes... Before merging, the horizons of the holes are "apparent", they're not "event horizons". Stretched horizons are coordinate dependent. They don't have any " fundamental" physical meaning...
@hugegamer59889 ай бұрын
@@dimitrispapadimitriou5622 I believe you have failed to understand correctly. From basic quantum mechanics we know the stretched infalling spacetime lengthens the wavelength to larger than the observed universe while with Heisenberg uncertainty we know the momentum is unfathomably large and these along with other basic postulates in quantum mechanics is what gives a physical spatial basis for maintaining a 2 dimensional surface that preserves information such as quantum states and entanglement. No need to see into the future any more than quantum mechanics currently does as measured on the benchtop.
@bryandraughn9830 Жыл бұрын
Isn't gravity weird enough to grab hold of empty space and "bend" it somehow? It's always struck me as odd that this is a given. Doesn't anyone at least have some hypothesis for how mass might do such a thing? Why should empty space care at all about an object being there? If the gravitational "field" exists everywhere to begin with, that helps, but ive not heard it described that way. Why would the gravitational field affect space when all of the others only affect particles? Gravity is extremely weird.
@scytale22423 ай бұрын
For the whole universe, including ourselves, nothing has ever entered into a black hole, yet. Anything you throw at it will take an infinite time, from the perspective of the rest of the universe, to cross the event horizon. So, what are we talking about ?
@jochemvanderspek51684 ай бұрын
the soundquality of the (remote?) guest is too poor to listen to comfortably on headphones :(
@portalsandmagicghostnumbercube2 жыл бұрын
There needs to be an amended Invisible/Holographic Principle of the Multiverse. A duality within a duality. A dual pair track of parallel principles. Two sides of the same coin. The Holographic Principle works well in individual universes, but a more complete Invisible/Holographic Principle would go beyond the curtain of our observable cosmos and into the multiverse.
@portalsandmagicghostnumbercube2 жыл бұрын
@@karagi101 The duality between the 1. invisible and holographic (the 2. Bound and 3. Bulk) duality within a duality. It really is a trinity.
@portalsandmagicghostnumbercube2 жыл бұрын
@@karagi101 hmmm.🤔
@waylayin61592 жыл бұрын
I figuered out how to get information out of a black hole. You take someone they go in head fiirst. And then they use sign language! And do that as fast as they can on what they see before they are in it completely
@waylayin61592 жыл бұрын
@@karagi101 American!
@JAYMOAP Жыл бұрын
Legend 👌
@vasyakalistrov81842 жыл бұрын
everything we found probably is emergent except maybe time... we need some strong emergency theories on different levels of emergency/complexity
@tiborkoos1882 жыл бұрын
I wish you continues the debate whether one of 2 equivalent alternative models can be considered as more reflective of reality. Especially Sean's point about the relative ease of evolving one versus the other form or representation. BTW, the evolution of representation of space in the MEC is am amazing fact. And interestingly that is 2D not 3D ! (not that this fact has anything to do with with the ADC thing, the mind as a whole has a 3D space model).
@diamon9992 жыл бұрын
I got a bit confused about the elphant at the centre of the universe. Sorry ;)
@EWischan2 жыл бұрын
Kylo Ren: "More"
@DapperDan-b2p Жыл бұрын
6 missed calls from Eric Weinstein.
@spaceinyourface2 жыл бұрын
I wonder what asking gravity nicely really means. Probably lots of maths ey !!
@bencegyurky1596 Жыл бұрын
Gravitiy is nothing. In the infinite realm only relative vacuums exist.But you can name it to absolute vacuum if you don't mind.
@spaceinyourface Жыл бұрын
@@bencegyurky1596 Cool,,,case closed,,,physicists can now rejoice in your wisdom.
@johnrowson22532 жыл бұрын
( My girlfriend is either in protective custody, or past ? ). I confess that was an issue here, but I wonder why ? , and if that question is productive in answering further queries ? it being what distracts me from working on what ‘spearheads’ what curiosity I have. When will the QM ( volume 2 ) be in print ? Thanks
@F_L_U_X2 жыл бұрын
:)
@emilylowrance79302 жыл бұрын
you won't get far by being humble, is that physics only?
@lionturtle19722 жыл бұрын
1:09:15 or maybe Quantum Mechanics is Bullshit.
@johnrowson22532 жыл бұрын
Sorry
@thorntontarr28942 жыл бұрын
@10:50 or so, " unfortunately, not including the one in which we seem to be living" says it all about this podcast. Moving on.
@imadetheuniverse4fun2 жыл бұрын
you're... disappointed that this podcast didn't solve quantum+gravity? lol