Non-Gaussianity from Baryon Asymmetry

Details Non-Gaussianity from Baryon Asymmetry Non-Gaussianity from Baryon Asymmetry

2008-09-12

arxiv.org/abs/0809.2242v3

JCAP 0901:002,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

25 pages, 7 figures; minor correction, references added; version to appear in JCAP

Scientific paper

10.1088/1475-7516/2009/01/002

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.

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