Non-Gaussianity from Baryon Asymmetry

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.

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

References in corpus (5)

• Detection of primordial non-Gaussianity (fNL) in the WMAP 3-year data at above 99.5% confidence
• The curvature perturbation in a box
• Curvaton Dynamics and the Non-Linearity Parameters in Curvaton Model
• Baryon Asymmetry in a Heavy Moduli Scenario
• Curvature Perturbation from Supersymmetric Flat Directions

Cited by in corpus (5)

• On the Issue of the ζSeries Convergence and Loop Corrections in the Generation of Observable Primordial Non-Gaussianity in Slow-Roll Inflation. Part I: the Bispectrum
• Limits on Isocurvature Perturbations from Non-Gaussianity in WMAP Temperature Anisotropies
• Hilltop Non-Gaussianity
• Non-Gaussianity and Baryonic Isocurvature Fluctuations in the Curvaton Scenario
• The Trispectrum in the Multi-brid Inflation