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Dark Matter and Leptogenesis from Gravitational Production
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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
Forward citations
Cited by 3 Pith papers
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Dark Matter Ultraviolet Freeze-in in General Reheating Scenarios
The paper derives analytic dark matter freeze-in yields for arbitrary power-law reheating histories and maps the gravitational production parameter space.
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Aspects of Gravitational Portals and Freeze-in during Reheating
During reheating, freeze-in from the gravitationally produced radiation bath can dominate the dark matter relic density for DM masses above the reheating temperature, with k- and n-dependent constraints.
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Relativistic accretion and burdened primordial black holes
Combining relativistic accretion with memory-burdened evaporation widens the parameter space for primordial black holes as dark matter and changes dark matter and dark radiation emission predictions.
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