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- W2770248161 abstract "Gravitational leptogenesis is a model of baryogenesis in which the matter-antimatter asymmetry of the universe arises through the standard model lepton-number gravitational anomaly. In this scenario, chiral gravitational waves source standard model neutrino helicity during the inflationary epoch. Since the standard model does not accommodate neutrino flavor oscillation data, it must be extended to provide nonzero neutrino masses. The origin of neutrino mass is presently unknown, and standard model neutrinos could be either Dirac or Majorana fermions. We point out that gravitational leptogenesis can be accommodated in either mass scenario. However, in the case where the light neutrinos are Majorana particles, there is an inherent channel for the washout of lepton-number during post-inflationary reheating. For Majorana neutrinos with the simplest model of reheating, we find that washout can be avoided if the equation of state of the universe during reheating is that of radiation and the standard model is not thermalized until below $T simeq 1 times 10^{12}$ GeV." @default.
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- W2770248161 date "2017-11-13" @default.
- W2770248161 modified "2023-09-27" @default.
- W2770248161 title "Gravitational Leptogenesis and Reheating" @default.
- W2770248161 hasPublicationYear "2017" @default.
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