Primordial black holes as dark matter

The possibility that the dark matter comprises primordial black holes (PBHs) is considered, with particular emphasis on the currently allowed mass windows at $1{0}^{16}--1{0}^{17}\text{ }\text{ }\mathrm{g}$, $1{0}^{20}--1{0}^{24}\text{ }\text{ }\mathrm{g}$ and $1--1{0}^{3}{M}_{\ensuremath{\bigodot}}$. The Planck mass relics of smaller evaporating PBHs are also considered. All relevant constraints (lensing, dynamical, large-scale structure and accretion) are reviewed and various effects necessary for a precise calculation of the PBH abundance (non-Gaussianity, nonsphericity, critical collapse and merging) are accounted for. It is difficult to put all the dark matter in PBHs if their mass function is…

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