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.