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Primordial Black Holes as a dark matter candidate -- a brief overview
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Historically the most popular dark matter candidates have been new elementary particles, such as Weakly Interacting Massive Particles and axions. However Primordial Black Holes (PBHs), black holes formed from overdensities in the early Universe, are another possibility. The discovery of gravitational waves from mergers of tens of Solar mass black hole binaries by LIGO-Virgo has generated a surge in interest in PBH dark matter. We overview the formation of PBHs, observational probes of their abundance, and some of the key open questions in the field.
Forward citations
Cited by 2 Pith papers
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Search for Planetary-mass Black Holes with an Improved Viterbi Algorithm
A Viterbi-based pipeline with an f^{-8/3} frequency remap and NMSE morphology consistency recovers injected planetary-mass binary inspirals in LIGO O3b data, with 95% recovery out to ~135 kpc in the most sensitive mas...
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ALP production from light primordial black holes: The role of superradiance
Superradiance from spinning light primordial black holes can boost moduli production by about ten orders of magnitude, and the resulting axion-like dark radiation tightens Planck-based limits on these black holes.
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