Cosmology
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. (…)
55. Eternal inflation: stochastic approach 3 (Inflationary perturbations 7)
Last time we have found that dynamics of the inflaton field (more precisely, its expectation value w.r.t. to the distribution among different Hubble patches) is determined by the Langevin equation. (…)
54. Eternal inflation: stochastic approach 2 (Inflationary perturbations 7)
In the previous post we have started to discuss the regime of eternal inflation realized when classical displacement of the inflaton field becomes comparable with the average amplitude of fluctuations generated at super-Hubble scale. (…)
53. Eternal inflation: stochastic approach 1 (Inflationary perturbations 7)
In this post I start to discuss physics of eternal inflation - regime where superhorizon cosmological perturbations become of the order 1.