A new algorithm for calculating the curvature perturbations in stochastic inflation

Дата и время публикации : 2013-08-22T03:00:10Z

Авторы публикации и институты :
Tomohiro Fujita
Masahiro Kawasaki
Yuichiro Tada
Tomohiro Takesako

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 14 pages, no figure
Первичная категория: astro-ph.CO

Все категории : astro-ph.CO, gr-qc, hep-ph, hep-th

Краткий обзор статьи: We propose a new approach for calculating the curvature perturbations produced during inflation in the stochastic formalism. In our formalism, the fluctuations of the e-foldings are directly calculated without perturbatively expanding the inflaton field and they are connected to the curvature perturbations by the $delta N$ formalism. The result automatically includes the contributions of the higher order perturbations because we solve the equation of motion non-perturbatively. In this paper, we analytically prove that our result (the power spectrum and the nonlinearity parameter) is consistent with the standard result in single field slow-roll inflation. We also describe the algorithm for numerical calculations of the curvature perturbations in more general inflation models.

Category: Physics