Non-gaussianity from baryon asymmetry

作者：Kawasaki Masahiro^*; Nakayama Kazunori; Takahashi Fuminobu

来源：Journal of Cosmology and Astroparticle Physics, 2009, 2009(1): 002.

DOI：10.1088/1475-7516/2009/01/002

• baryon asymmetry
• cosmology of theories beyond the SM
• physics of the early universe

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, fNL, is negative, if the Affleck-Dine mechanism accounts for the observed baryon asymmetry; otherwise it can be either positive or negative.

• 出版日期2009-1