Hilltop Non-Gaussianity
High Energy Physics - Phenomenology
2009-01-16 v2 Astrophysics
Abstract
We study non-Gaussianity induced by a pseudo Nambu-Goldstone boson with a cosine-type scalar potential. We focus on how the non-Gaussianity is affected when the pseudo Nambu-Goldstone boson rolls down from near the top of the scalar potential where the deviation from a quadratic potential is large. We find that the resultant non-Gaussianity is similar to that obtained in the quadratic potential, if the pseudo Nambu-Goldstone boson accounts for the curvature perturbation; the non-Gaussianity is enhanced, otherwise.
Keywords
Cite
@article{arxiv.0810.1585,
title = {Hilltop Non-Gaussianity},
author = {Masahiro Kawasaki and Kazunori Nakayama and Fuminobu Takahashi},
journal= {arXiv preprint arXiv:0810.1585},
year = {2009}
}
Comments
12 pages, 3 figures; References added; to appear in JCAP