Hilltop non-gaussianity

Masahiro Kawasaki; Kazunori Nakayama; Fuminobu Takahashi

doi:10.1088/1475-7516/2009/01/026

Hilltop non-gaussianity

Masahiro Kawasaki, Kazunori Nakayama, Fuminobu Takahashi

Research output: Contribution to journal › Article › peer-review

51 Citations (Scopus)

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.

Original language	English
Article number	026
Journal	Journal of Cosmology and Astroparticle Physics
Volume	2009
Issue number	1
DOIs	https://doi.org/10.1088/1475-7516/2009/01/026
Publication status	Published - 2009
Externally published	Yes

Keywords

Cosmology of theories beyond the SM
Physics of the early universe

ASJC Scopus subject areas

Astronomy and Astrophysics

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10.1088/1475-7516/2009/01/026

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AB - 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.

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