Dr. Debasish Borah

We study the possibility of generating baryon asymmetry of the universe (BAU) and dark matter (DM) from primordial black holes (PBH). PBH with appropriate initial mass can evaporate into both baryons as well as the mother particle responsible for creating the observed BAU (considered to be a heavy fermion N) along with DM. While PBH can be the only source of N and DM, there can be a hybrid setup where they can be produced from both PBH as well as the thermal bath. Since PBH decays into the other light degrees of freedom as well, the entropy dilution also plays a crucial role in generating the final abundance of BAU and DM. We consider a specific particle physics realisation of BAU and DM and study the consequence of PBH, especially in the mass range of $0.1-10^5$ g. Apart from the specific prediction of such low scale particle physics scenarios within reach of colliders and other laboratory experiments, the PBH of the mass range considered here can lead to very high frequency gravitational waves that can be probed at future experiments.