Cosmology
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. (…)
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. (…)
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. (…)
118. Last two weeks of November on NEQNET
Well, those two weeks were quite productive ones! (…)
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 ? (…)
110. Introducing doubt in Bayesian statistics 1
This is a guest post by my old friend Pascal Vaudrevange, who was a student of Lev Kofman when we were together in CITA, and is now a postdoc at Case Western University working with Glenn Starkman. (…)
99. Eternal inflation with many light scalar fields
I am going to briefly discuss one result from the recent paper by Peter Adshead, Richard Easther and Eugene Lim. (…)
97. Second week of November on NEQNET
Physics
* Quintessence on the string theory landscape? (…)
96. Quintessence with w less than -1
In another very interesting recent paper on quintessence the Italian Team (Creminelli, D’Amico, Norena, Vernizzi - and warmest regards from Helsinki if you read it, Filippo :-)) is trying to construct an reliable example of QFT that behaves like the quintessence with ?ghost-like? (…)
94. Quantum scale invariance on the lattice
Arguably, the most interesting paper in archives today is the one by M. Shaposhnikov and I. Tkachev. (…)
92. A new theory of galaxy formation needed
It is well known that an ordinary galaxy can be described by seven physical parameters: total mass, baryon fraction, age, specific angular momentum, specific heat energy (related to random motion within the galaxy), its radius and concentration. (…)
90. Unidentified extended sources of gamma ray emission
Here is another open problem in astrophysics :-), as far as I understand…
The H.E.S.S. system of telescopes in Namibia is among most successful instruments of its kind. (…)
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