Hilltop Non-Gaussianity

Details Hilltop Non-Gaussianity Hilltop Non-Gaussianity

2008-10-09

arxiv.org/abs/0810.1585v2

JCAP 0901:026,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 3 figures; References added; to appear in JCAP

Scientific paper

10.1088/1475-7516/2009/01/026

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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