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Eliminating the LIGO bounds on primordial black hole dark matter

Research output: Contribution to journalArticlepeer-review

Céline Bœhm, Archil Kobakhidze, Ciaran A.J. O'Hare, Zachary S.C. Picker, Mairi Sakellariadou

Original languageEnglish
Article number078
JournalJournal of Cosmology and Astroparticle Physics
Issue number3
PublishedMar 2021

Bibliographical note

Publisher Copyright: © 2021 IOP Publishing Ltd and Sissa Medialab. Copyright: Copyright 2021 Elsevier B.V., All rights reserved.

King's Authors


Primordial black holes (PBHs) in the mass range (30-100) Mo˙ are interesting candidates for dark matter but are tightly constrained by the LIGO merger rate. In deriving these constraints, PBHs were treated as constant Schwarzschild masses. A careful analysis of cosmological black holes however leads to a time-dependent effective mass. This implies stricter conditions for binary formation, so that the binaries formed merge well before LIGO's observations. The observed binaries are those coalescing within galactic halos, at a rate consistent with LIGO data. This reopens the possibility of LIGO mass PBH dark matter.

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