Trapping effects on inflation
Abstract
We develop a Lagrangian approach based on the influence functional method so as to derive self-consistently the Langevin equation for the inflaton field in the presence of trapping points along the inflaton trajectory. The Langevin equation exhibits the backreaction and the fluctuation-dissipation relation of the trapping. The fluctuation is induced by a multiplicative colored noise that can be identified as the the particle number density fluctuations and the dissipation is a new effect that may play a role in the trapping with a strong coupling. In the weak coupling regime, we calculate the power spectrum of the noise-driven inflaton fluctuations for a single trapping point and studied its variation with the trapping location. We also consider a case with closely spaced trapping points and find that the resulting power spectrum is blue.
Keywords
Cite
@article{arxiv.1101.4493,
title = {Trapping effects on inflation},
author = {Wolung Lee and Kin-Wang Ng and I-Chin Wang and Chun-Hsien Wu},
journal= {arXiv preprint arXiv:1101.4493},
year = {2015}
}
Comments
13 pages, 2 figures