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Quasi-extremal primordial black holes are a viable dark matter candidate

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arxiv 2301.13215 v2 pith:XE6A2HTY submitted 2023-01-30 astro-ph.CO gr-qchep-th

classification astro-ph.COgr-qchep-th
keywords blackholesdarkmatterprimordialquasi-extremalanalysesappeals
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Black hole evaporation is generally considered inevitable for low-mass black holes, yet there is no confirmation of this remarkable hypothesis. Here, we propose a phenomenological model that appeals to the possible survival of light quasi-extremal primordial black holes as a significant dark matter component and show that the related cosmological and astrophysical constraints disappear for reasonable degrees of quasi-extremality. The results obtained are general, conservative and should be taken as a proof of principle for future, model-specific analyses.

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Cited by 1 Pith paper

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  1. Evaporating cosmologically coupled black holes

    astro-ph.CO 2026-07 conditional novelty 6.0 of 10

    If a black hole's mass grows with cosmic expansion, Hawking evaporation is slowed or reversed, weakening gamma-ray bounds on primordial black holes.

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