Right-handed neutrinos as the source of density perturbations

Abstract

We study the possibility that cosmological density perturbations are generated by the inhomogeneous decay of right-handed neutrinos. This will occur if a scalar field whose fluctuations are created during inflation is coupled to the neutrino sector. Robust predictions of the model are a detectable level of non-Gaussianity and, if standard leptogenesis is the source of the baryon asymmetry, a baryon isocurvature perturbations at the level of the present experimental constraints.

arXiv comment14 pages, 2 figures

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Cited by in corpus (6)

• Limits on f_NL parameters from WMAP 3yr data
• Limits on Isocurvature Perturbations from Non-Gaussianity in WMAP Temperature Anisotropies
• Non-Gaussianity and Baryonic Isocurvature Fluctuations in the Curvaton Scenario
• Adiabatic versus Isocurvature Non--Gaussianity
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