AdS/CFT
Real-time gauge/gravity duality
Balt van Rees from the U. of Amsterdam continues the discussion of non-equilibrium AdS/CFT we have started not so long time ago. Since his recent paper with Skenderis was one of the major achievements in the field, I highly recommend going through his post. Dmitry.
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A bound on the speed of sound from holography?
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This post is authored by Aleksey Cherman (on the left) and Abhinav Nellore (on the right). Aleksey is a graduate student in the nuclear theory group at the University of Maryland, College Park, working with Tom Cohen, and Abhi is a graduate student in Steve Gubser’s group at Princeton. Dmitry. |  |
We all know that sound travels at about 343 m/s in air, and much faster than that in many solids. But just how much faster could sound travel if given the chance? Could there be a medium in which the speed of sound can approach the speed of light? Or might there be some more stringent fundamental bound on the speed of sound?
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Fermionic Schwinger-Keldysh propagators from AdS/CFT
Gregory Giecold is a PhD student at CEA, Saclay. Dmitry.
In this post I will describe recent work on fermionic Schwinger-Keldysh propagators from AdS/CFT. For further details and references see ArXiv: 0904.4869.
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321. Holographic hydrodynamics
Miguel Paulos is a PhD student at DAMTP, U. of Cambridge working on non-equilibrium AdS/CFT. Dmitry.
In this post I will describe recent work done by myself, Robert Myers, and Aninda Sinha to understand strongly coupled plasmas with a finite chemical potential. For more details and full references see 0903.2834.
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302. Dynamical black holes & expanding plasmas
Pau Figueras, research associate at the Department of Mathematical Sciences in Durham University, works on black hole solutions (and their relatives) in string theory. Dmitry.
The AdS/CFT correspondence has over the years played an invaluable role in providing insight into the dynamics of strongly coupled gauge theories. An important application of the correspondence has been to understand the holographic description of hydrodynamic properties of field theories. This can be used to understand qualitative features of the Quark-Gluon plasma (QGP) produced in heavy ion collisions. Current theoretical understanding of this system is that subsequent to rapid thermalization, the system evolves as an almost ideal fluid, expanding rapidly away from the central collision region. The evolution in this regime has been well described by the so called Bjorken flow [1].
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297. Exact gravity dual of a gapless superconductor
This is a guest post by George Koutsoumbas from the National Technical University of Athens. Dmitry.
I would like to thank Dmitry for the invitation to write a blog entry on my recent work with E.Papantonopoulos and G. Siopsis entitled “Exact Gravity Dual of a Gapless Superconductor”, arXiv:0902.0733 [hep-th].
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291. Chiral symmetry breaking in soft wall AdS/QCD model
This is a guest post by Tom Kelley from the U. of Minnesota who works on AdS/QCD with Tony Gherghetta. Dmitry.
I would like to thank Dmitry for inviting me to talk a little about chiral symmetry breaking in the soft-wall AdS/QCD model, a topic in my recent work “Chiral Symmetry Breaking in Soft-Wall AdS/QCD” (arXiv:hep-ph/0902.1998). In this post, I’d like to paint, in broad strokes, the picture of how AdS/QCD incorporates chiral symmetry breaking.
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284. Kerr/CFT: A paradigm to understand the entropy of real black holes?
This is a guest blog post by Geoffrey Compere from the UCSB.
Recently, a correspondence has been proposed between extremal black holes and a chiral two-dimensional CFT. This correspondence might be of interest for real astrophysical black holes. For example, the massive black hole in the Milky Way whose nickname is GRS 1915+105 has a rotation to mass square ratio
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254. Continuing dS/CFT – the correspondence. Part 1
When I’ve discussed dS/CFT correspondence last time, I listed several criticisms of it, but probably had to explain in the first place what is the essence of dS/CFT 
According to Bousso, Maloney and Strominger, the correspondence works as follows.
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226. Top ten open problems in physics
What is the ultimate purpose of my work as theoretical physicist and, if you want, my existence itself? Is it serving the community of other physicists like organizing and participating in conferences? Nop. Then, maybe teaching future physicists in the University, encourage young people to enter the exciting field of physics? Not quite. Writing good papers? Ei. Maybe blogging? Sorry but nein. I think… the ultimate purpose of my work is solving unsolved mysteries in physics. I am afraid, this and only this makes my work enjoyable for me, makes it fun. For the sake of future reference, let me enlist here the most important (from my point of view), hard and interesting unsolved problems in physics.
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223. Starting dS/CFT: Hilbert space
Since I was recently thinking of the dS/CFT correspondence, I find it natural to also start discussing facts and hypotheses related to dS/CFT and other gauge theory – gravity dualities on the blog. In what follows, we will mostly discuss 4-dimensional gauge theories.
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206. A conference on black holes at PI
A very interesting conference organized by Rob Meyers, Herman Verlinde and Jaume Gomis takes place currently in PI. The topic of the conference is related to information loss in black holes and unitarity of quantum gravity in general (the one that I tried to discuss so unsuccessfully on the blog in December – I am a kind of being better prepared now ).
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170. Back to AdS/QCD – interview with Josh
As you may remember, recently Josh Erlich has made a guest blog post about AdS/QCD at NEQNET. I think that the discussion we had after the post is so terrific that it is worth reposting here in the form of brief interview with Josh. Another reason for reposting is that you, guys, did not want to get into nice physics discussion with Josh, while he was still around (he is attending some conf in Argentina now, as I understand). So, here you go (D. – me, J. – Josh Erlich):
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163. What is AdS/QCD?
This is a a guest post by Josh Erlich from the College of William and Mary, Williamsburg. Dmitry.
This is a summary of AdS/QCD based on a recent review talk I gave at the Confinement 8 conference in Mainz, Germany. For more details and a list of references, the talk is posted on the arxiv as arxiv:0812.4976.
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158. Young Researchers Conference at Perimeter Institute
… has finished several weeks ago, and all talks are now online at PIRSA. To my knowledge, the main purpose of the conference is to put together short listed candidates for postdoctoral positions at PI – an equivalent of interview with important difference that candidates show themselves to each other, interact with each other and accept questions from each other while discussing and presenting their work. At the same time, the hiring committee carefully makes important observations, orchestrates the whole process and decides. If you are a small graduate student, and you are interested to learn really well how the hiring process works, I strongly encourage you to watch as many talks from this conference as you can including discussion sections after talks.
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