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.
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Viscosity/Entropy ratio and unitary evolution in quantum gravity
Calculations of the shear viscosity of the quark-gluon plasma (QGP), observed in heavy ions collisions, are performed via the AdS/CFT correspondence [ref1]. One finds that the shear viscosity of the ...
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How would one experimentally prove AdS/CFT correspondence?
What would be an experimental test of AdS/CFT correspondence? Or it's extensions?
I've heard that people are studying AdS/CMT (condensed matter) correspondence, but I don't know the details of it?
...
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The double-trace deformation effect in AdS/CFT
Let me use this paper as the reference for this.
I want to understand better the argument at the bottom of page 6.
If the bulk $AdS$ metric is written as $\frac{1}{r^2}(dr^2 + A(r)ds_{boundary}(x)^...
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Charged CFT observables and AdS/CFT
I have a simple question regarding the holographic dictionary when mapping operators on the CFT side to those in AdS.
One piece of the dictionary is that a global symmetry maps onto a gauge symmetry ...
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What's the relation between the Euler $\psi$ function, the digamma function, and the hypergeometric function?
Can somebody help me out with the intermediate details of eqn. (2.5) in this paper?
Generalized gravitational entropy. Aitor Lewkowycz and Juan Maldacena. arXiv:1304.4926.
Is the Euler $\psi$ ...
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Why are holomorphic boundary CFT2 primary operators massless in the AdS3 bulk?
I saw a claim in this paper that holomorphic boundary CFT$_2$ primary operators correspond to massless states in the AdS$_3$ bulk. Specifically,
As always, we simplify the situation by assuming the ...
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What do we learn from gravity in three spacetime dimensions?
The last decades there has been a lot of research going on in the the area of three dimensional gravity. The motivation, I understand, is threefold:
Whereas gravity is not perturbatively ...
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Generalisations of AdS/CFT with string theory on both sides
From my previous post, I found out from the comments that there are various generalisations of AdS/CFT with different things replacing the CFT on the RHS; such as AdS/CMT, AdS/QCD, and also with ...
asked Aug 23 '13 at 19:43
Abhimanyu Pallavi Sudhir
5,3174 gold badges27 silver badges46 bronze badges
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Asymptotic Symmetry Group of General Relativity
This question is a little vague and I hope I can put across what I am looking for without too much confusion.
What is the motivation behind studying asymptotic symmetry groups in the context of ...
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Chemical Potential in AdS/CFT
In AdS/CFT a charged Black hole is probably someway equivalent to introducing a chemical potential (Chemical potential) at the boundary theory. Is there a quick way to see how it is or how does this ...
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Collapse of two large black holes in AdS
In $4d$ flat space, two black holes of mass $M$ can collapse to form another one of (roughly) mass $2M$. This process is spontaneous, as reflected by the fact that the black hole entropy $S=M^2$ ...
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Is there some no-go theorem for $D=9$ Kaluza Klein QCD+EM?
While QCD is a typical product of AdS/CFT and some other research trends in extra dimensions, I have never found in the literature an example producing the non-chiral part of the standard model, ...
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What is the physical interpretation of the Papadodimas/Raju mirror operators?
In this paper
http://arxiv.org/abs/1310.6335,
the authors discuss the firewall problem and contruct so called mirror operators appearing in the correlation function. The key part seems to be (2.6) ...
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String Field Theory and AdS/CFT
I am a PhD student and I am choosing the topic to work on in the graduate school. I am interested in various non-perturbative aspects of String Theory. Does anybody know if there were any attempts to ...
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What happens at the center of a black hole according to holographic theory?
As far as I understand, the AdS/CFT correspondence proposed by Maldacena is an exact duality to a four-dimensional theory, which interpolates between one well-defined conformal field theory in the UV ...
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Conformal compatification of Minkowski and AdS
How do I show that the compactification of Minkowski is given by the quadric
$$uv-\eta_{ij}x^{i}x^{j}=0$$
with an overall scale equivalence in the coordinates.I get that for $v \neq 0$, the surface ...
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Has AdS/CFT any predictive power in the natural context?
Has AdS/CFT any predictive power in the case of the space-time as we know it and in the case of reality as we know it experimentally?
I may add: AdS/CFT in the interpretation given from the ...
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How much can AdS/CMT tell us?
I will begin my research on AdS/CMT, however I find AdS/CMT is only a phenomelogical method, so I want to know can AdS/CMT give some results the condensed matter physicists can not give, or even ...
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Diffeomorphisms and boundary conditions
I am trying to find out how did the authors in this paper (arXiv:0809.4266) found out the general form of the diffeomorphism which preserve the boundary conditions in the same paper.
I found this ...
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Taking the continuum limit of $U(N)$ gauge theories
I would like to draw your attention to appendix $C$ on page 38 of this paper.
The equation $C.2$ there seems to be evaluating the sum $\sum_R \chi _R (U^m)$ in equation 3.16 of this paper. I ...
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Flat Space Limit of AdS/CFT is S-Matrix Theory
In an answer to this question, Ron Maimon said:
The flat-space limit of AdS/CFT boundary theory is the S-matrix theory
of a flat space theory, so the result was the same--- the "boundary"
...
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Gravity duals to Navier Stokes and interpretation of non linear contributions
I have been reading the paper The Incompressible Non-Relativistic Navier-Stokes Equation from Gravity. In it they state,
"An instability, if it occurs, must necessarily break a symmetry ...
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Help with the understanding of boundary conditions on $AdS_3$
So I am trying to reproduce results in this article, precisely the 3rd chapter 'Virasoro algebra for AdS$_3$'. I have the metric in this form:
$$ds^2=-\left(1+\frac{r^2}{l^2}\right)dt^2+\left(1+\frac{...
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Master Field Large N limit
I would like to ask a question about the so-called ''Master Field''. As far as I understand, this represents a classical configuration in the large n limit (saddle point solution) but there is no ...
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Are all the asymptotic symmetries always infinite dimensional?
We know that the asymptotic symmetry of AdS$_3$ is the Virasoro symmetry, which is infinite dimensional. For flat spacetimes, the BMS group is also infinite dimensional. So are all the asymptotic ...
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Can pure-bosonic string theories exist in curved spacetime?
Question: Can there be a consistent non-supersymmetric pure-bosonic string theory in some curved spacetimes?
Reason: Since fields with certain amount of negative mass can exist in curved spacetime (...
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The surface area to volume ratio of a sphere and the Bekenstein bound
I am trying to relate the surface-area-to-volume-ratio of a sphere to the Bekenstein bound. Since the surface-area-to-volume-ratio decreases with increasing volume, one would surmise that, per unit of ...
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Partition Functions in (A)dS/CFT
I'm trying to understand some aspects of dS/CFT, and I'm running into a little trouble. Any help would be much appreciated.
In arXix:1104.2621, Harlow and Stanford showed that the late-time Hartle-...
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Can quark-gluon plasma ever be close to an ideal gas of asymptotically free quarks?
The question inspired by an upcoming colloquim at UCB.
A naive interpretation of quark asymptotic freedom seems to imply that at high enough energies they should be weakly interacting. On the other ...
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A basic question on AdS/CFT
Previously I asked a question Question on dimensions of CFT operators (ref: MAGOO, hep-th/9905111) here and it was (correctly of course) answered by Motl. I realized I didn't understand a part of it ...
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Is there non-locality in the AdS/CFT?
Many String theorists are trying to restore bulk locality in the AdS/CFT. So does that mean the CFT, the boundary, is non-local? Does matter travel faster than light on the CFT?
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What is on the AdS side in AdS/CFT supergravity or string theory?
What really is on the AdS side in AdS/CFT, does it always have to be string theory or is sometimes supergravity "enough" or better suited to do calculations?
From the answers to my earlier question, ...
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Can the study of the quantum information structure in QFT with holographic duals be relevant to string theory?
I'm interested in characterizing the behaviour of measures of quantum information in strongly correlated quantum field theories which admit a gravity dual description, e.g through AdS/CFT duality. In ...
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Is $\mathcal{N} = 4$ SYM a “toy model”?
The second sentence of the Wikipedia article on $\mathcal{N} = 4$ supersymmetric Yang-Mills theory describes it as "a simplified toy theory." But the AdS/CFT correspondence conjectures that it is ...
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AdS Black holes
How is the mass of the black hole defined in a asymptotcally AdS solution of the black hole? How can I find it?
Beacause in asymptotcally flat solution I can read it from the $g_{tt}$ component of the ...
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Boundary conditions in AdS/CFT
This question is in reference to this very famous paper of Witten.
In general through the whole paper why is the author able to just focus on the scalar field propagating in the bulk and not need to ...
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Open strings from closed strings
This issue comes up in Shiraz's lecture here on 29th October 2008.
I understand that he is saying that one can think of closed string theory as having two minima and that the ground state in the non-...
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AdS/RCFT examples?
RCFT's (rational conformal field theories) in two dimension are very well-studied, but it seems that there is no any gravity dual of such theories has been found. Is there example of the holographic ...
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“Hard wall”/ “soft wall”
I have encountered those terms in various places. As I understand it, "soft wall" can correspond to a smooth cutoff of some spacetime, while "hard wall" can be a sharp one, which can be described in ...
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Turbulence parameterization from gravity - fluid dynamics correspondence
I`m looking for a nice introductary reference that explains how the turbulence coefficient or any kind of turbulence parameterization (in view of applications to atmospheric turbulence for example) ...
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Derivation of Eq. 7.12 in the review paper of Kraus
I'm reading "Lectures on black holes and the $AdS_3/CFT_2$ correspondence" by Kraus.
http://arxiv.org/abs/hep-th/0609074
I don't know how one can obtain Eq.7.12. My stupid question is how to obtain ...
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Holography on non-AdS spacetime
I have a question regarding AdS/CFT and what it teaches about our world. AdS/CFT if often treated as our best tool to explore quantum gravity, and people have worked very hard in trying to understand ...
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Has Sen quantized superstring fields?
Today I saw a paper by Ashoke Sen titled "BV Master Action for Heterotic and Type II String Field Theories".
Is it really the "quantization" of superstring fields for the first time?
What can be its ...
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Charged black holes and AdS/CFT
People generalize the statements of AdS/CFT correspondence by adding black hole (charged black hole) in the gravity theory to provide the dual gauge theory finite temperature (finite density). I have ...
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Questions on D branes and their role in the AdS/CFT correspondence
I'm a beginner in learning the AdS/CFT correspondence, and I come across two problems that I hope an answer will be given here.
D branes in string theory are usually introduced through the T-duality ...
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AdS/CFT dual of $N$ D$p$-branes at finite temperature
The gravity dual of $N$ D$p$-branes at zero temperature is
$$ ds^2= H^{-1/2}(r)(-dt^2+dx_p^2) + H^{1/2}(r)(dr^2 + r^2d\Omega_{8-p}^2) $$
with
$$ H(r) = 1 + \left(\frac{R}{r}\right)^{7-p} $$
what ...
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How do Aharony et. al conclude that all scalar fields in the supergravity multiplet are periodic?
This question is for anyone who has read/gone through the paper above or knows anything about AdS/CFT. The paper can be found here.
On page 46, eq. (2.33), the author finds solutions to the scalar ...
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Conserved currents in higher-spin theories
After the proposal of Maldacena (AdS/CFT), there have been numerous attempts to find out gravity duals of various kinds of CFT. Klebanov and Polyakov gave one such correspondence here. The claim is ...
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Superconformal approach to supergravity
In the book (Supergravity - Daniel Z.Freedman & Antoine Van Proeyen - Cambridge), there is (Chapters 16-17) a presentation of pure supergravity or supergravity with matter, from a superconformal ...
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Boundary conditions for fields in Kerr/CFT
I am reading a paper by Guica et al. on Kerr/CFT correspondence (arXiv:0809.4266) and I'm not sure if I got this. They choose the boundary conditions, like a deviation of the full metric from the ...
