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

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Cited by in corpus (29)

• Non-linear isocurvature perturbations and non-Gaussianities
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• A geometric description of the non-Gaussianity generated at the end of multi-field inflation
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• Hilltop Non-Gaussianity
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• The Trispectrum in the Multi-brid Inflation
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• Isocurvature perturbations in extra radiation
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• Non-Gaussian isocurvature perturbations in dark radiation
• Elementary Theorems Regarding Blue Isocurvature Perturbations
• Fermionic Isocurvature Perturbations
• Affleck-Dine baryogenesis with R-parity violation
• Extended analysis of CMB constraints on non-Gaussianity in isocurvature perturbations
• Quadratic Isocurvature Cross-Correlation, Ward Identity, and Dark Matter
• Adiabatic versus Isocurvature Non--Gaussianity
• Affleck-Dine baryogenesis with modulated reheating
• Non-gaussianity and Statistical Anisotropy in Cosmological Inflationary Models
• The R-axion and non-Gaussianity