Baryogenesis in the Early Matter Dominated Epoch

Abstract

While thermal dark matter is created in the early Universe, nonthermal dark matter can be generated through Hawking radiation from primordial black hole (PBH). If the reannihilation process of the nonthermal dark matter violates B-number and CP-symmetry, successful baryogenesis can be obtained in the early Universe. Consequently, this model can explain both the correct relic density of dark matter and the observed relic density of baryon asymmetry in the Universe by employing an ultralight mass for PBH and a larger total annihilation cross section for TeV dark matter. This corresponding large annihilation cross section of dark matter would open the opportunity to search for them and to test this model in the indirect detection of dark matter.