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127. Ashtekar at Perimeter Institute
Abhay Ashtekar has recently visited the Perimeter Institute and gave a couple of talks – about loop quantum gravity of course, since he is one of the major players in the LQG field (considered to be its inventor). I think, both of the talks are worth watching (or at least scanning through his transparencies available [...]
126. From quarks to strings. Migdal-Makeenko equation and AdS-CFT correspondence
Although Lubos wants to see my answer to the poll , I decided to finish my analysis of the recent Polyakov’s paper today. Page 6. In order to justify my picture I have used intuition coming from the loop equation, while Klebanov and Maldacena appealed to the D brane picture of the gauge fielauds. Both [...]
125. From quarks to strings. On Liouville mode, instantons and confinement in abelian theories
Alexander Polyakov have released this week a preprint about history of string theory, which is also so full of non-trivial physical ideas that I decided to list some of them in this post as well as to include my comments (or rather my ramblings ) So, here we go. On Page 2. It took some [...]
124. Talk in Munich. Regularizing correlators of curvature perturbation
This post is hopefully the last one in the series devoted to my seminar in Munich Last time I have explained why correlation functions of the scalar field on de Sitter background should be actually infrared finite. This time, using similar trick, I will argue that the correlation functions of the curvature perturbation (by curvature [...]
123. AdS/CFT and condensed matter applications
This post is going to be, I think, somewhat controversial but… if you feel that I greatly miss some important point regarding the subject, then please feel free to explain that to me in the comments. And the subject is… ta-da-da-daam… how exactly string theory may help us to solve some problems in condensed matter [...]
122. Where are quarks in the Wilson loop?
An anonymous reader from Spain asks in comments to my “Wilson loop – physical introduction” post: Why do you interpret a mathematical expresion that displays a gluon field (Amu) as a qqbar loop? Where are the q fields? Why they don’t appear in the Wilson loop but you still interpret they’re there? And where did [...]
121. On interaction between coherent condensate and turbulent flow in two dimensions
It looks like I did not review new nice papers in ArXiv for so long time While I have no idea what is the reason for this particular fact, I tell you that the ultimate reason for similar facts was always my tremendous laziness. What could a man do with such an evil? The only [...]
120. Talk in Munich. Regularizing inflaton correlation functions
Let me get again back from confinement to eternal inflation , or more precisely, to the infrared behavior of correlation functions of a self-interacting massless scalar field on de Sitter background. In what follows, I will consider the case (a QFT in fixed dS spacetime). As I have explained in the post about leading logs, naive perturbation theory (expanding [...]
119. Fun with energy gap for QCD Born-Oppenheimer Hamiltonian
Let us try to solve the Exercise 2 in this post about the Wilson loop. Since we, scientists, are all lazy (as you are!), that’s what I would like to do: I will give three different solutions of the exercise with three different answers Then, if you are interested to learn the subject (and you [...]
118. Last two weeks of November on NEQNET
Well, those two weeks were quite productive ones! – 19 posts in overall (or 20 including this one ) This counts to 1.5 posts per day (and you should take into account that I was on leave to Munich for 4 days). I hope my writing was not too boring for you Physics * Eternal [...]
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On moduli stabilisation in heterotic orbifolds
April 24, 2012 09:04 -
A holographic model of the quantum Hall effect
April 19, 2012 09:04 -
Transdimensional Multiverse Measures
April 18, 2012 11:04 -
Large non-Gaussianity from axion inflation
January 31, 2012 14:01 -
On strong disorder renormalization
March 18, 2011 20:03
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Momchil: I want to ask the experts about an apparent confusion, that appears in many papers on the Unruh effect. As you stat...
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Paul: Excellent list! how lucky you are to be involved in the effort to solve some of these. On time, I question its re...
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philbert: Simple illustration and may apply to mixed layer boundary layers, how about the stable and other types of boundary ...
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Micro: Can 2 question provide a common solution? Black holes, information loss paradox and Ultra high energy cosmic rays. ...
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James Ph. Kotsybar: SAGITTARIUS A* -- James Ph. Kotsybar Mysteriously cloaked, obscure despite Interior illuminating glare, Long ...
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cad: The presentation can be found in several formats at http://pirsa.org/08110051/...
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Leo: Ok I have a question: if a black hole is supermassive, say 100 billion solar mass, let's suppose Alice fells int...
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superkuh: I am glad you are back! No more disapointing weekly refreshings of that monkey....
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