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Following a new microlensing constraint on primordial black holes (PBHs) with$\sim10^{20}$--$10^{28}\,\mathrm{g}$~[1], we revisit the idea of PBH as allDark Matter (DM). We have shown that the updated observational constraintssuggest the viable mass function for PBHs as all DM to have a peak at $\simeq10^{20}\,\mathrm{g}$ with a small width $\sigma \lesssim 0.1$, by imposingobservational constraints on an extended mass function in a proper way. We havealso provided an inflation model that successfully generates PBHs as all DMfulfilling this requirement.

Inflationary Primordial Black Holes as All Dark Matter