Speaker
Description
It is suggested that Primordial Black Holes (PBHs) could be one of the plausible constituents of Massive Compact Halo Objects (MACHOs). It is likely that such PBHs were produced after the completion of inflation (or more specifically, during the epoch of reheating). We follow a particular scenario of PBH formation which is based on the Affleck-Dine mechanism of baryogenesis. It was predicted that if there was a coupling between inflation and baryon complex scalar field, bubbles of baryonic matter could be created, which at a later stage form PBHs. It was shown that such PBHs have the log-normal mass function. In this work, we put constraints on the parameters of this log-normal distribution from observational data. For this distribution, we have calculated the fraction of the energy density of Dark Matter (DM) that is contributed by MACHO and the calculated value is much smaller than the result observed in different microlensing experiments. This inconsistency between calculated and observed data may indicate that PBHs have formed clusters and their distribution at present time may be direction-dependent.
