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Primordial Black Holes as Dark Matter: Recent Developments

Authors
  • Carr, Bernard
  • Kühnel, Florian
Type
Published Article
Journal
Annual Review of Nuclear and Particle Science
Publisher
Annual Reviews
Publication Date
Oct 19, 2020
Volume
70
Pages
355–394
Identifiers
DOI: 10.1146/annurev-nucl-050520-125911
Source
Annual Reviews
Keywords
License
Green

Abstract

Although the dark matter is usually assumed to be made up of some form of elementary particle, primordial black holes (PBHs) could also provide some of it. However, various constraints restrict the possible mass windows to 1016–1017 g, 1020–1024 g, and 10–103M⊙. The last possibility is contentious but of special interest in view of the recent detection of black hole mergers by LIGO/Virgo. PBHs might have important consequences and resolve various cosmological conundra even if they account for only a small fraction of the dark matter density. In particular, those larger than 103M⊙ could generate cosmological structures through the seed or Poisson effect, thereby alleviating some problems associated with the standard cold dark matter scenario, and sufficiently large PBHs might provide seeds for the supermassive black holes in galactic nuclei. More exotically, the Planck-mass relics of PBH evaporations or stupendously large black holes bigger than 1012M⊙ could provide an interesting dark component.

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