Connecting Primordial Black Hole to boosted sub-GeV Dark Matter through neutrino

Abstract

The explorations of alternative dark matter (DM) candidates beyond WIMP motivated primordial black holes (PBHs) or sub-GeV DM particle in the Milky Way. Neutrinos from PBH evaporation at the present times play as a novel medium boosting sub-GeV DM and leaving signatures in the terrestrial experiments. We explore the boosted DM by the neutrino flux from PBH evaporation (PBH$\hat{I}½$BDM) so as to connect the macroscopic PBHs to sub-GeV DM particle. We consider this PBH$\hat{I}½$BDM scenario to interpret the XENON1T keV excess. The projected bounds on the sub-GeV DM-electron scattering cross section and the fraction of DM composed of PBHs $f_{\mathrm{PBH}}$ are imposed for future experiments.

6 pages, 4 figures