Inflationary primordial black holes as all dark matter

Abstract

Following a new microlensing constraint on primordial black holes (PBHs) with $\ensuremath{\sim}1{0}^{20}--1{0}^{28}\text{ }\text{ }\mathrm{g}$ [H. Niikura et al., arXiv:1701.02151.], we revisit the idea of PBH as all dark matter (DM). We have shown that the updated observational constraints suggest the viable mass function for PBHs as all DM to have a peak at $\ensuremath{\simeq}1{0}^{20}\text{ }\text{ }\mathrm{g}$ with a small width $\ensuremath{\sigma}\ensuremath{\lesssim}0.1$, by imposing observational constraints on an extended mass function in a proper way. We have also provided an inflation model that successfully generates PBHs as all DM fulfilling this requirement.