Separable and non-separable multi-field inflation and large non-Gaussianity

Дата и время публикации : 2012-03-15T20:46:11Z

Авторы публикации и институты :
Anupam Mazumdar
Lingfei Wang

Ссылка на журнал-издание: JCAP09(2012)005
Коментарии к cтатье: 21 pages, 6 figures
Первичная категория: astro-ph.CO

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

Краткий обзор статьи: In this paper we provide a general framework based on $delta N$ formalism to estimate the cosmological observables pertaining to the cosmic microwave background radiation for non-separable potentials, and for generic emph{end of inflation} boundary conditions. We provide analytical and numerical solutions to the relevant observables by decomposing the cosmological perturbations along the curvature and the isocurvature directions, emph{instead of adiabatic and entropy directions}. We then study under what conditions large bi-spectrum and tri-spectrum can be generated through phase transition which ends inflation. In an illustrative example, we show that large $f_{NL}sim {cal O}(80)$ and $tau_{NL}sim {cal O}(20000)$ can be obtained for the case of separable and non-separable inflationary potentials.

Category: Physics