期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 6, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2021/06/028
关键词
baryon asymmetry; dark matter theory
资金
- Universidad Antonio Narino [2019101, 2019248]
- Spanish FEDER/MCIU-AEI [FPA2017-84543-P]
- Patrimonio Autonomo - Fondo Nacional de Financiamiento para la Ciencia, la Tecnologia y la Innovacion Francisco Jose de Caldas (MinCiencias - Colombia) [80740-465-2020]
- FAPESP [2019/11197-6]
- CNPq [301271/2019-4]
- European Union [860881]
The study explores the possibility that dark matter is generated purely from gravitational scatterings together with long-lived heavy Majorana right-handed neutrinos. The late decay of these neutrinos could inject significant entropy into the thermal bath, affecting the dark matter abundance and cosmic baryon asymmetry.
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.
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