GUT Scale Inflation, Non-Thermal Leptogenesis, and Atmospheric Neutrino Oscillations
Abstract
Description
Leptogenesis scenarios in supersymmetric hybrid inflation models are considered. Sufficient lepton asymmetry leading to successful baryogenesis can be obtained if the reheat temperature T_r>10^6 GeV and the superpotential coupling parameter kappa is in the range 10^-6<kappa<10^-2. For this range of kappa the scalar spectral index n_s=0.99+-0.01. Constraints from neutrino mixing further restrict the range of kappa that is allowed. We analyze in detail the case where the inflaton predominantly decays into the next-to-lightest right handed Majorana neutrino taking into account especially the constraints from atmospheric neutrino oscillations.
1+18 pages, 8 figures. v.2: Abridged and revised, comments and references added, now 1+16 pages, 7 figures, to appear in PLB
1+18 pages, 8 figures. v.2: Abridged and revised, comments and references added, now 1+16 pages, 7 figures, to appear in PLB