Eliminating the LIGO bounds on primordial black hole dark matter
Céline Bœhm, Archil Kobakhidze, Ciaran A.J. O'Hare, Zachary S.C. Picker, Mairi Sakellariadou
Abstract
Abstract 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.
Topics & Concepts
PhysicsLIGOPrimordial black holeDark matterAstrophysicsBinary black holeGravitational waveStellar black holeBlack hole (networking)AstronomySchwarzschild radiusCosmologyIntermediate-mass black holeMerge (version control)Binary numberHot dark matterFormalism (music)Dark fluidDark energyScalar field dark matterGravitationMicro black holePulsars and Gravitational Waves ResearchCosmology and Gravitation TheoriesAstronomy and Astrophysical Research