Abstract
We consider an extended version of superconformal subcritical hybrid inflation model by introducing three right-handed neutrinos that have the Majorana mass terms. In the model one of the right-handed sneutrinos plays a role of the inflaton field, and it decays to reheat the universe after inflation. The vacuum expectation value for the waterfall field gives an unconventional pattern of the light neutrino mass matrix, and the neutrino Yukawa couplings that determine the reheating temperature are not constrained by the neutrino oscillation data. Consequently thermal leptogenesis or sneutrino leptogenesis is realized.
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Gunji, Y., Ishiwata, K. Leptogenesis after superconformal subcritical hybrid inflation. J. High Energ. Phys. 2019, 65 (2019). https://doi.org/10.1007/JHEP09(2019)065
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DOI: https://doi.org/10.1007/JHEP09(2019)065