Quantum field theory
131. Non-gaussianities from postinflationary universe
Mark Trodden and Alessandra Silvestri have recently released a paper about signatures of non-gaussianity from the post-inflationary early Universe. (…)
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). (…)
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. (…)
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. (…)
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. (…)
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. (…)
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? (…)
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. (…)
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. (…)
118. Last two weeks of November on NEQNET
Well, those two weeks were quite productive ones! (…)
117. Recent lattice QCD simulations - how good is QCD in the infrared?
A very interesting paper on lattice QCD spectroscopy by the European collaboration (DESY, Marceille, Wuppertal, Julich) is published in the recent issue of Science.The authors were able to reproduce the mass scales of light hadrons which coincide with measured ones up to 1% precision (take a look at the Table 1 in the paper). (…)
115. Talk in Munich. Leading logs
Last time I have claimed that the leading IR divergences in the loop expansion for the inflaton pair correlation function in theory contribute in the form of expansion
. (…)
112. Talk in Munich. Other two interesting infrared scales
As Instanton figured out in comments to the previous post, the scale is related to the self-reproduction scale. How to show this? (…)
111. Talk in Munich. One interesting infrared scale in inflationary cosmology
I am back to Helsinki, was not this visit really short? :-)
For those of you how were unable to come to the Sommerfeld Center in Munich to hear my talk and for those of you who were there but did not understand it ? (…)
108. How stringy is QCD string?
I am in Munich now, so please forgive me for being a bit quiet
As I’ve explained in this small introduction into criteria of confinement, breaking of the chromoelectric tube (string) connecting heavy quark and antiquark happens through the production of a pair of light quark and antiquark in the strong chromoelectric field. (…)
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