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arXiv · 2101.02475

Coalescing primordial binary black holes with log-normal mass spectrum

Konstantin Postnov·Alexander Dolgov·Nikita Mitichkin·Ivan Simkin
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Abstract

Primordial black holes created in the early Universe can constitute a substantial fraction of dark matter and serve as seeds for early galaxy formation. Binary primordial black holes with masses of the order of a few dozen solar masses can explain the observed LIGO/Virgo gravitational-wave events. In this Letter, we show that primordial black holes with log-normal mass spectrum centered at $M_0\simeq 15-17 M_\odot$ simultaneously explain both the chirp mass distribution of the detected LIGO/Virgo binary black holes and the differential chirp mass distribution of merging binaries as inferred from the LIGO/Virgo observations. The obtained parameters of log-normal mass spectrum of primordial black holes also give the fraction of seeds with $M\gtrsim 10^4 M_\odot$ required to explain the observed population of supermassive black holes at $z=6-7$.

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Konstantin Postnov, Alexander Dolgov, Nikita Mitichkin, Ivan Simkin. 2021-01-07. Coalescing primordial binary black holes with log-normal mass spectrum. https://arxiv.org/abs/2101.02475

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