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GUT Scale Inflation, Non-Thermal Leptogenesis, and Atmospheric Neutrino Oscillations
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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.
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Cited by 2 Pith papers
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Right-Handed Neutrino Production by an Axion-like Inflaton: Implications for Leptogenesis
A derivative-coupled axion-like inflaton can produce the heavy right-handed neutrinos whose decays explain the observed baryon asymmetry, with the required CP violation lower in the prompt-decay regime.
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Supersymmetric Hybrid Inflation with K\"{a}hler-Induced $\mathbf{R}$-Symmetry Breaking
Nonrenormalizable R-symmetry breaking in the Kahler potential can tune the spectral index of supersymmetric hybrid inflation into the ACT DR6 window while keeping tensor modes below 1e-5.
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