Hilltop non-gaussianity

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52 Citations (Scopus)


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 languageEnglish
Article number026
JournalJournal of Cosmology and Astroparticle Physics
Issue number1
Publication statusPublished - 2009
Externally publishedYes


  • Cosmology of theories beyond the SM
  • Physics of the early universe

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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