Primordial black holes and lepton flavor violation with scotogenic dark matter
Teruyuki Kitabayashi (Department of Physics, Tokai University, , , 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292, , , Japan)
Abstract We show that if the lepton flavor-violating μ → eγ process is observed in the MEG II experiment, the initial density of primordial black holes (PBHs) can be constrained with scotogenic dark matter. As a benchmark case, if PBH evaporation occurs in the radiation-dominated era, the initial density may be 2 × 10$^{−17}$ ≲ β ≲ 3 × 10$^{−16}$ for the (TeV)-scale dark sector in the scotogenic model, where β is the ratio of the PBH density ρ$_{PBH}$ to the radiation density ρ$_{rad}$ at the time of PBH formation. As another benchmark case, if PBHs evaporate in the PBH-dominated era, the initial density may be 1 × 10$^{−8}$ ≲ β ≲ 3 × 10$^{−7}$ for (GeV)-scale dark matter, with other (TeV)-scale particles in the scotogenic model.