Quantum field theory
47. Planck 2008: First and second days
First and second days of the PLANCK 2008 conference: flavor physics, RS phenomenology, WMAP, bigravity, WIMPonium, black holes and number of species.
45. Quantization of cosmological perturbations. Mukhanov-Sasaki variable (Inflationary perturbations 5)
I introduce Mukhanov-Sasaki variable, show how to quantize inflationary perturbations and again calculate the power spectrum of primordial perturbations - by QFT this time.
43. Schwinger-Keldysh: Martin-Siggia-Rose diagrammatics (non-equilibrium diagrammatic methods 2)
I start to discuss Martin-Siggia-Rose diagrammatic methods and transition from Fokker-Planck equation back to quasiclassical Schwinger-Keldysh action.
42. Recalling a couple of facts about 2D and 3D Ising models
I discuss free fermion representation for the 2D Ising model and mention how string theory can be related to the critica behavior of the 3D Ising model.
39. Schwinger-Keldysh: Quasiclassical Keldysh action (non-equilibrium diagrammatic methods 1)
I discuss quasi-classical approximation for the Schwinger-Keldysh action and show that the quasi-classical evolution is described by the Langevin equation.
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.
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
35. Lectures on AdS/CFT by Maldacena
Lectures on AdS/CFT by Juan Maldacena
34. Several questions about de Sitter
I ask several questions about Green’s functions on de Sitter
33. Schwinger-Keldysh: information carried by Keldysh Green’s functions (nonequilibrium diagrammatic methods 1)
I discuss information carried by Keldysh Green’s functions in the non-equilibrium quantum field theory.
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.
31. Schwinger-Keldysh: brief review (Nonequilibrium diagrammatic methods 1)
I briefly discuss what physical problems require the use of non-equilibrium diagr. QFT methods. I also review the structure of Green functions in SK formalism.
27. Eye on ArXiv: 24 Apr 2008 - Detection of dark matter?
There was a lot of buzz recently (including the paper in New York Times) concerning the claim by DAMA/LIBRA team - they detected dark matter interactions with their detector at the level of 8 sigma
Their approach is the following: they try to find annual modulations in their DM signal (interaction of WIMPs with the material of their detector) due to fact that Earth is orbiting around the Sun. (…)
25. Geometry and causal structure of de Sitter space (Inflationary perturbations 4)
I discuss geometry, causal structure and behavior of QFT Green functions in de Sitter space
23. Eye on ArXiv: 21 Apr 2008 - SUSY/non-SUSY duality
And so the new week began… Would be fun to finish another paper till Friday (the subject is “IR divergencies in de Sitter space”). (…)
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