Dark Matter and Leptogenesis from Gravitational Production

Abstract

Since the gravitational interaction is universal, any particle that ever existed, if kinematically accessible, has to be produced through her. We explore the possibility that dark matter is generated purely from gravitational scatterings together with heavy Majorana right-handed neutrinos that are long-lived. Their late decay could inject significant entropy into the thermal bath, diluting both the dark matter abundance and the cosmic baryon asymmetry, thereby imposing various constraints on the reheating dynamics. Additionally to the entropy injection, long-lived right-handed neutrinos could also be responsible for generating the baryon asymmetry through leptogenesis, and hence establish some nontrivial relations between the dark matter and the right-handed properties, and the reheating dynamics

14+5 pages, 6 figures. V2 matches version accepted in JCAP

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Cited by in corpus (10)

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• Rescuing High-Scale Leptogenesis using Primordial Black Holes
• WIMPs, FIMPs, and Inflaton phenomenology via reheating, CMB and $\Delta N_{eff}$
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• Gravitational SIMPs