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GUT Scale Inflation, Non-Thermal Leptogenesis, and Atmospheric Neutrino Oscillations
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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.
Forward citations
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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Nonthermal leptogenesis via cosmological gravitational particle production is tested by inflationary gravitational waves
Certain inflation models produce right-handed neutrinos via gravitational effects sufficient for leptogenesis to explain the baryon asymmetry, testable by inflationary gravitational waves.
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