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arXiv · 2302.06981

On the primordial binary black hole mergings in LIGO-Virgo-Kagra data

Konstantin Postnov·Nikita Mitichkin
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Abstract

We briefly discuss a possible cosmological implication of the observed binary black hole mergings detected by LIGO-Virgo-Kagra collaboration (GWTC-3 catalogue) for the primordial black hole (PBH) formation in the early Universe. We show that the bumpy chirp mass distribution of the LVK BH+BH binaries can be fit with two distinct and almost equal populations: (1) astrophysical mergings from BH+BH formed in the modern Universe from evolution of massive binaries and (2) mergings of binary PBHs with initial log-normal mass distribution. We find that the PBH central mass ($M_c\simeq 30 M_\odot$) and distribution width derived from the observed LVK chirp masses are almost insensitive to the assumed double PBH formation model. To comply with the observed LVK BH+BH merging rate, the CDM PBH mass fraction should be $f_{pbh}\sim 10^{-3}$ but can be higher if PBH clustering is taken into account.

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Konstantin Postnov, Nikita Mitichkin. 2023-02-14. On the primordial binary black hole mergings in LIGO-Virgo-Kagra data. https://arxiv.org/abs/2302.06981

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