Non-gaussianity from baryon asymmetry

Masahiro Kawasaki, Kazunori Nakayama, Fuminobu Takahashi

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

We study a scenario that large non-Gaussianity arises from the baryon asymmetry of the Universe. There are baryogenesis scenarios containing a light scalar field, which may result in baryonic isocurvature perturbations with some amount of non-Gaussianity. As an explicit example we consider the Affleck-Dine mechanism and show that a flat direction of the supersymmeteric standard model can generate large non-Gaussianity in the curvature perturbations, satisfying the observational constraints on the baryonic isocurvature perturbations. The sign of a non-linearity parameter, f NL, is negative, if the Affleck-Dine mechanism accounts for the observed baryon asymmetry; otherwise it can be either positive or negative.

Original languageEnglish
Article number002
JournalJournal of Cosmology and Astroparticle Physics
Volume2009
Issue number1
DOIs
Publication statusPublished - 2009
Externally publishedYes

Keywords

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

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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