Low scale leptogenesis and dark matter in the presence of primordial black holes

Understand

We study the possibility of low scale leptogenesis along with dark matter (DM) in the presence of primordial black holes (PBH).

• For a common setup to study both leptogenesis and DM we consider the minimal scotogenic model which also explains light neutrino mass at radiative level.
• While PBH in the mass range of $0.1-10^5$ g can, in principle, affect leptogenesis, the required initial PBH fraction usually leads to overproduction of scalar doublet DM whose thermal freeze-out occurs before PBH evaporation.
• PBH can lead to non-thermal source of leptogenesis as well as dilution of thermally generated lepton asymmetry via entropy injection, with the latter being dominant.