Bayesian analysis of the spin distribution of LIGO/Virgo black holes. (arXiv:2010.13811v2 [astro-ph.CO] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Garcia_Bellido_J/0/1/0/all/0/1">Juan Garcia-Bellido</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Siles_J/0/1/0/all/0/1">Jose Francisco Nu&#xf1;o Siles</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Morales_E/0/1/0/all/0/1">Ester Ruiz Morales</a>

Gravitational wave detection from binary black hole (BBH) inspirals has
become routine thanks to the LIGO/Virgo interferometers. The nature of these
back holes remains uncertain. We study here the spin distributions of
LIGO/Virgo black holes from the first catalogue GWTC-1 and the first four
published BBH events from run O3. We compute the Bayes evidence for several
independent priors: flat, isotropic, spin-aligned and anti-aligned. We find
strong evidence for low spins in all of the cases, and significant evidence for
small isotropic spins versus any other distribution. When considered as a
homogeneous population of black holes, these results give support to the idea
that LIGO/Virgo BBH are primordial.

Gravitational wave detection from binary black hole (BBH) inspirals has
become routine thanks to the LIGO/Virgo interferometers. The nature of these
back holes remains uncertain. We study here the spin distributions of
LIGO/Virgo black holes from the first catalogue GWTC-1 and the first four
published BBH events from run O3. We compute the Bayes evidence for several
independent priors: flat, isotropic, spin-aligned and anti-aligned. We find
strong evidence for low spins in all of the cases, and significant evidence for
small isotropic spins versus any other distribution. When considered as a
homogeneous population of black holes, these results give support to the idea
that LIGO/Virgo BBH are primordial.

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