Eliminating the LIGO bounds on primordial black hole dark matter

Primordial black holes (PBHs) in the mass range (30–100) M ⊙ 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...

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Published inJournal of cosmology and astroparticle physics Vol. 2021; no. 3; p. 78
Main Authors Bœhm, Céline, Kobakhidze, Archil, A.J. O'Hare, Ciaran, S.C. Picker, Zachary, Sakellariadou, Mairi
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.03.2021
Subjects
Black holes
Coalescing
Constraints
Dark matter
Galactic halos
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ISSN1475-7516
1475-7516
DOI10.1088/1475-7516/2021/03/078

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Summary:Primordial black holes (PBHs) in the mass range (30–100) M ⊙ 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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ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2021/03/078