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Flores, Marcos M.; Perez-Gonzalez, Yuber F.
Physical review. D, 6/2024, Letnik: 109, Številka: 11Journal Article
We investigate the generation of the baryon asymmetry within the framework of cosmological gravitational particle production, employing the Bogoliubov approach. We examine two well-known baryogenesis scenarios, namely baryogenesis in grand unified theories (GUT) and leptogenesis, while considering reheating temperatures sufficiently low for thermal processes to be negligible. Considering α –attractor T-models for the inflaton potential, we demonstrate that GUT baryogenesis from scalar decays can be successful across a large range of conformal couplings with gravity, without necessitating substantial levels of C P violation. In the case of leptogenesis, we find that the reheating temperature should be T RH ≲ 10 6 GeV for right-handed neutrino masses M 1 ≲ 6 × 10 12 GeV to generate the observed asymmetry. Published by the American Physical Society 2024
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