Questions tagged [ads-cft]
AdS/CFT is a special case of the holographic principle. It states that a quantum gravitating theory in Anti-de-Sitter (AdS) space is exactly equivalent to the gauge theory/Conformal Field Theory (CFT) on its boundary.
592
questions
46
votes
3
answers
12k
views
Why is Sachdev-Ye-Kitaev (SYK) Model model important?
In the past one or two years, there are a lot of papers about the Sachdev-Ye-Kitaev Model (SYK) model, which I think is an example of $\mathrm{AdS}_2/\mathrm{CFT}_1$ correspondence. Why is this model ...
- 2,071
46
votes
2
answers
14k
views
Introduction to AdS/CFT
AdS/CFT seems like a really hot topic and I'd like to start reading about. I am looking for the best introduction at my level, i.e. I have a background in QFT, CFT and general relativity at the level ...
32
votes
2
answers
12k
views
Why are anti-de Sitter spaces so interesting when we believe the universe is expansionary?
Perhaps this is a naive question, but in my recent (admittedly limited) readings about AdS spaces, I keep wondering why they seem to be such a hotbed for theoretical research (AdS/CFT correspondence, ...
- 1,454
26
votes
2
answers
2k
views
Which CFTs have AdS/CFT duals?
The AdS/CFT correspondence states that string theory in an asymptotically anti-De Sitter spacetime can be exactly described as a CFT on the boundary of this spacetime.
Is the converse true? Does any ...
Squark
25
votes
2
answers
5k
views
When one discusses the "boundary" of Anti-de Sitter space, what do they mean precisely?
The AdS/CFT correspondence refers to the "boundary" of AdS space but I'm a little confused about what this means. Typically, one writes the AdS metric in the form $$ds^2= \frac{L^2}{z^2}(-...
- 3,492
24
votes
5
answers
3k
views
What's so special about AdS?
This question is coming from someone who has very little experience with M-Theory but is intrigued by the AdS/CFT correspondence and is beginning to study it.
Why is the gauge/gravity duality ...
- 8,800
23
votes
3
answers
4k
views
Mathematics of AdS/CFT
To date, what is the most mathematically precise formulation of the AdS/CFT correspondence, and what are the most robust tests of the conjecture?
- 2,850
22
votes
8
answers
4k
views
Reversing gravitational decoherence
[Update: Thanks, everyone, for the wonderful replies! I learned something extremely interesting and relevant (namely, the basic way decoherence works in QFT), even though it wasn't what I thought I ...
- 2,472
21
votes
1
answer
4k
views
What is the definition of a "UV-complete" theory?
I would like to know (1) what exactly is a UV-complete theory and (2) what is a confirmatory test of that?
Is asymptotic freedom enough to conclude that a theory is UV-complete?
Does it become ...
- 4,619
21
votes
1
answer
2k
views
Duality between Euclidean time and finite temperature, QFT and quantum gravity, and AdS/CFT
The thoughts below have occurred to me, several years ago (since 200x), again and again, since I learn quantum field theory(QFT) and statistical mechanics, and later AdS/CFT. It is about the duality ...
- 7,848
19
votes
3
answers
1k
views
Has the black hole information loss paradox been settled?
This question was triggered by a comment of Peter Shor's (he is a skeptic, it seems.) I thought that the holographic principle and AdS/CFT dealt with that, and was enough for Hawking to give John ...
- 4,323
18
votes
1
answer
2k
views
What is the CFT dual to pure gravity on AdS$_3$?
Pure $2+1$-dimensional gravity in $AdS_3$ (parametrized as $S= \int d^3 x \frac{1}{16 \pi G} \sqrt{-g} (R+\frac{2}{l^2})$) is a topological field theory closely related to Chern-Simons theory, and at ...
- 181
18
votes
1
answer
797
views
Does local physics depend on global topology?
Motivating Example
In standard treatments of AdS/CFT (MAGOO for example), one defines $\mathrm{AdS}_{p+2}$ as a particular embedded submanifold of $\mathbb R^{2,p+1}$ which gives it topology $S^1\...
- 57.7k
17
votes
4
answers
2k
views
Isn't gravity non-local and non-causal?
The way I think of this is that, I can ask physical questions about a space-time which are impossible to answer unless one knows the full space-time, and hence I am inclined to believe that gravity is ...
- 4,619
17
votes
1
answer
768
views
AdS/CFT at D = 3
AdS/CFT at D = 3 (on the AdS side) seems to have some special issues which I bundled into a single question
The CFT is 2D hence it has an infinite-dimensional group of symmetries (locally). The ...
Squark