Ultra slow-roll inflation demystified
High Energy Physics - Phenomenology
2017-12-06 v3 Cosmology and Nongalactic Astrophysics
High Energy Physics - Theory
Abstract
Ultra-slow-roll (USR) inflation is a new mode of inflation which corresponds to the occasions when the inflaton field must traverse an extremely flat part of the scalar potential, when the usual slow-roll (SR) fails. We investigate USR and obtain an estimate for how long it lasts, given the initial kinetic density of the inflaton. We also find that, if the initial kinetic density is small enough, USR can be avoided and the usual SR treatment is valid. This has important implications for inflection-point inflation.
Keywords
Cite
@article{arxiv.1707.05644,
title = {Ultra slow-roll inflation demystified},
author = {Konstantinos Dimopoulos},
journal= {arXiv preprint arXiv:1707.05644},
year = {2017}
}
Comments
10 pages, published version