Abstract
We study baryogenesis in a hybrid inflation model which is embedded to the minimal supersymmetric model with right-handed neutrinos. Inflation is induced by a linear combination of the right-handed sneutrinos and its decay reheats the universe. The decay products are stored in conserved numbers, which are transported under the interactions in equilibrium as the temperature drops down. We find that at least a few percent of the initial lepton asymmetry is left under the strong wash-out due to the lighter right-handed (s)neutrinos. To account for the observed baryon number and the active neutrino masses after a successful inflation, the inflaton mass and the Majorana mass scale should be 1013 GeV and \( \mathcal{O} \)(109–1010) GeV, respectively.
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Acknowledgments
We thank Chee Sheng Fong for fruitful discussions. This work is supported by JST SPRING, Grant No. JPMJSP2135 (YG), JSPS KAKENHI Grant No. JP18H05542, JP20H01894, and JSPS Core-to-Core Program Grant No. JPJSCCA20200002 (KI).
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Gunji, Y., Ishiwata, K. & Yoshida, T. Supersymmetric baryogenesis in a hybrid inflation model. J. High Energ. Phys. 2023, 201 (2023). https://doi.org/10.1007/JHEP08(2023)201
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DOI: https://doi.org/10.1007/JHEP08(2023)201