%0 Journal Article
%T Hilltop Non-Gaussianity
%A Kawasaki
%A Masahiro
%A Nakayama
%A Kazunori
%A Takahashi
%A Fuminobu
%J High Energy Physics - Phenomenology
%D 2008
%I 
%R 10.1088/1475-7516/2009/01/026
%X 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.
%U http://arxiv.org/abs/0810.1585