Journal club
69. Happy Halloween!
Since it is Halloween, today’s story is about ghosts…
Let us follow the analysis of massive gravity theory in de Sitter background by Izumi and Tanaka. (…)
67. Weak lensing and modifying gravity
Jochen Weller et al. are trying to constrain the modified gravity theories with weak lensing data combined with baryon acoustic oscillations and supernovae data. (…)
66. Some interesting talks worth watching
Steve Carlip talks about topologically massive gravity at Perimeter, namely, about 3d topologically massive gravity in AdS and finds that it is unstable (even for chiral values Strominger mentioned at Strings 08). (…)
65. Simulations of decaying turbulence
A group of people (with Jonathan Dursi being the only one I know personally among them) has written nice review of existing software for stimulating decaying compressible (supersonic) turbulence with the goal to compare performance of the codes. (…)
59. Eye on Arxiv: Quantum corrections to eta/s
I decided to turn the de Sitter discussion off for a moment, it would be more appropriate to return to it after the paper is ready anyway Hopefully, it will not take too much time for you to see it in ArXives. (…)
58. Stability of de Sitter space: dS as a perfect interferometer
Let us now show that QFT of a massive scalar field in de Sitter space features instabilities if the number of dimensions is odd. (…)
57. Stability of de Sitter space: statement of the problem 1
Ok, friends, I feel that the time has come to let you know about things I am currently involved in – namely, understanding of intrinsic stability of the de Sitter space. (…)
51. Planck 2008: day 4 - Soft wall AdS/QCD
I discuss the soft wall AdS/QCD model introduced by Batell&Gherghetta, where AdS gravity and dilaton behavior providing soft wall cutoff is introduced self-consistently.
38. And again about effective QFT for inflation
I show that effective QFT corrections to correlator of Mukhanov variable found by Armedariz-Picon et al. are due to effects of eternal inflation.
37. Eye on PRL - On statistical theory of developed turbulence
I discuss developed turbulence a bit: dynamics of vorticity in the inertial interval and Kolmogorov cascade.
36. Eye on ArXiv: 6 May 2008 - Where does the cosmological perturbation theory actually break down?
I discuss the issue of cosmological perturbation theory breakdown and its relation to the regime of eternal inflation
32. Eye on ArXiv: 30 Apr 2008 - Curvature perturbation from false vacuum inflation
Power spectrum of primordial perturbations is calculated for inlationary models with false minima of the inflaton potential.
30. Eye on ArXiv: 30 Apr 2008 - Effective QFT for inflation
Today, I think, the most interesting paper in ArXiv is the one by Steven Weinberg called “Effective field theory for inflation“. I would say, it generalizes results by Cheung et al. (…)
29. Eye on ArXiv: 28 Apr 2008 - D3/D7 brane inflation
I would like to briefly discuss the paper
Michael Haack, Renata Kallosh, Axel Krause, Andrei Linde, Dieter Lust, Marco Zagermann, “Update of D3/D7-Brane Inflation on K3 x T^2/Z_2″
released last friday. (…)
28. Eye on ArXiv: 24 Apr 2008 - dS vacua in no-scale SUGRA; multifield DBI inflation
Laura Covi et al., de Sitter vacua in no-scale supergravities and Calabi-Yau string models; D. Langlois et al., Primordial fluctuations and non-Gaussianities in multi-field DBI inflation
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