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Hilltop Non-Gaussianity · Around

2008

Hilltop Non-Gaussianity

Kawasaki, Masahiro, Nakayama, Kazunori, Takahashi, Fuminobu

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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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