arXiv:2007.10722astro-ph.CO
Primordial Black Holes as a dark matter candidate
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Abstract
The detection of gravitational waves from mergers of tens of Solar mass black hole binaries has led to a surge in interest in Primordial Black Holes (PBHs) as a dark matter candidate. We aim to provide a (relatively) concise overview of the status of PBHs as a dark matter candidate, circa Summer 2020. First we review the formation of PBHs in the early Universe, focusing mainly on PBHs formed via the collapse of large density perturbations generated by inflation. Then we review the various current and future constraints on the present day abundance of PBHs. We conclude with a discussion of the key open questions in this field.
The "black holes as dark matter" were termed MACHOs (massive astrophysical compact halo object) https://en.wikipedia.org/wiki/Massive_compact_halo_object Most of that has been ruled out (see the graph on http://resonaances.blogspot.com/2016/06/black-hole-dark-matt... ) and while…
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