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/sci/ - Science & Math

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11056809 No.11056809 [Reply] [Original]

so we all admit that bulk string theories in 5D anti-de Sitter space have a 1-1 mapping with 4D conformal field theories defined on the boundary of that anti-de Sitter space. it's clear -- the AdS/CFT "dictionary" spells it all out.

however, i'm worried that these things might not translate to the actual universe, since it is de-Sitter (not anti-de Sitter [AdS]). maybe it is all a fluke?

Lenny Susskind, i.e. the Boss Clown of the Stanford Clown Posse, says that black holes are holographic because muh-I-Beat-Hawking, and that proves holography right in the real world. honestly, that seems weak.

so what do you guys think? holography=real or holography=meme?

>> No.11056864

>>11056809
I don't know about string theory can you explain it like im 5?

>> No.11056875

>>11056864
yeah, sure. particles aren’t particles, they’re really 1d. they are described by a particular lagrangian (see: Nambu-Goto action) that only can describe what we see if the universe has 10 total dimensions, 6 of which are “compactified” to the size where we could never detect them. under these assumptions it is easy to make a single theory of all fundamental forces in the standard model as well as gravity, unifying all the known forces in nature. but unfortunately once we do that there are approximate 10^1000 different possibilities for what it actually implies, so it’s kinda stuck

>> No.11056906

>>11056875
so how can you tell particles 1 dimensional if we've never seen one?

>> No.11059257

>>11056809
>o we all admit that bulk string theories in 5D anti-de Sitter space have a 1-1 mapping with 4D conformal field theories defined on the boundary of that anti-de Sitter space. it's clear -- the AdS/CFT "dictionary" spells it all out.

sounds like your looking through the wrong side of a looking glass with that 5D anti-de Sitter space when you could start at the bottom in 2d mapping of holographic space providing a 3 dimensional framework bubble. :)

>> No.11059268

>>11056875
>6 of which are “compactified” to the size where we could never detect them
>there are approximate 10^1000 different possibilities for what it actually implies

So it's worthless.

>> No.11059282

>>11059268
i would say so.
try eric verlindes work he's pretty much on the right track when taking about holography mapping and space.

>> No.11059433

>>11056809
How can a person like Susskind live with themselves, knowing they make money off the fame of an (also completely overhyped) dead criple?
How does Susskind see himself? Does he tell himself putting fascination into peoples head is fundamentally good so blowing things out of proportion and reporting on vague stuff as if it was established and as if there wouldn't be lots of just as good theories by quieter autists, and all for personal gain... is fair game. I mean I can see how you can see it like that, but my concious would cuck me.

>> No.11059625

>>11059433
lenny was the first guy to coin the name “string” theory (his initial phrasing was “violin string”). all his other contributions to physics (e.g. technicolor) are dead as doornails, so in order to save his legacy he needs to shill any and every string meme, even if he needs to steal it from ‘t Hooft or Maldacena or Hawking. his legacy is at stake. if you’re that old and you want to die as a hero instead of a nobody, fuck having a conscious—that’s probably how lenny thinks now

>> No.11059650

>>11056809
What does cell biology have to do with string theory?

>> No.11059774

>>11059650
lel, good one

>> No.11059810

>>11059774
i don't get it

>> No.11059819

>>11056809
Doesn't describe our universe, still not a meme but a useful framework. See holographic condensed matter.

>> No.11059899

>>11059819
>holographic condensed matter
yes, i have heard of AdS/"CMT" but i am unaware of any real results they have. can you make a good case for it?

afaik they basically are like "hey look maybe we could reformulate some previously known thing in AdS/CFT dictionary style and then it looks easy if you already know some extremely hard shit so it's really harder but let me act like it's easier anyway"

>> No.11059920

>>11059810
The op picture

>> No.11059964

>>11059268
It is a finite number though, which in principle is better than the infinitely possible values of constants that the Standard Model uses.

>> No.11060567

>>11059964
this.

>> No.11060599
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11060599

>>11056809
Low-dim AdS/CFT need not have physical relevance through only cosmology.
https://arxiv.org/abs/0901.0924
Holography maps charged anti-de Sitter blackholes onto Quantum Hall states. This opens doors to many applications of SUSYstrings and superconformals to strongly-correlated condensed matter systems.
In fact, a twisted variant of homological mirror symmetry has been formulated through the study of topological phases enriched by non-symmorphic space groups (https://arxiv.org/abs/1806.11385).). The third string revolution is going to be spearheaded by condensed matter theorists and you can quote me on this.

>> No.11061180

>>11059433
Susskind pushes boudaries, years/decades later, others accept it as facts.

>> No.11061240

>>11060599
i mean, Kitaev has already done some interesting quantum gravity stuff with the SYK model but HEP absorbed it quickly. witten even had one of his students write her thesis about it. i doubt witten would be far behind any developments coming from condensed matter guys