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2019

Enhanced cosmological perturbations and the merger rate of PBH binaries

Garriga, Jaume, Triantafyllou, Nikolaos

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The rate of merger events observed by LIGO/Virgo can be used in order to probe the fraction $f$ of dark mater in the form of Primordial Black Holes.

Here, we consider the merger rate of PBH binaries, accounting for the effect of cosmological perturbations on their initial eccentricity $e$.
The torque on the binaries receives significant contributions from a wide range of scales, that goes from the size of the horizon at the time when the binary forms, down to the co-moving size of the binary.
In scenarios where PBH are formed from adiabatic perturbations, it is natural to expect an enhancement of the power spectrum $P_\Phi$ at small scales, where it is poorly constrained observationally.

Enhanced cosmological perturbations and the merger rate of PBH binaries · Around

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