Dark matter and dark radiation from evaporating primordial black holes
Dip. di Fisica e Scienze della Terra, Ferrara University and INFN, Ferrara, Italy
2 Theoretical Physics Department, CERN, Geneva, Switzerland
Accepted: 26 June 2020
Published online: 9 July 2020
Primordial black holes in the mass range from to g might have existed in the early universe. Via their evaporation mechanism (completed before Big Bang Nucleosynthesis), they might have released stable particles beyond the Standard Model. We reconsider the possibility that such particles might constitute the main part or a fraction of the dark matter observed today, updating the impact on this scenario from warm dark matter constraints. If sufficiently light, stable particles from primordial black holes evaporation might also provide a significant contribution to dark radiation. We generalize previous studies on this interesting dark matter and dark radiation production mechanism, by including the effects of accretion and a possible amount of entropy nonconservation. We also discuss in some detail specific examples of stable particle candidates beyond the Standard Model.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2020