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.

14 pages, 2 figures

References in corpus (3)

• Three Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Polarization Analysis
• Probing String Theory with Modulated Cosmological Fluctuations
• Flavoured leptogenesis: a successful thermal leptogenesis with N_1 mass below 10^8 GeV

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• 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
• About a (standard model) universe dominated by the right matter
• Moriond Electroweak 2006: Theory Summary