Gravitational wave detection from binary black hole (BBH) inspirals has become routine thanks to the LIGO/Virgo interferometers. The nature of these black 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 gives support to the idea that LIGO/Virgo black holes are primordial.

借助LIGO / Virgo干涉仪，从二元黑洞（BBH）吸气中进行重力波检测已成为常规操作。这些黑洞的性质仍然不确定。我们在这里研究来自第一个目录GWTC-1的LIGO /处女座黑洞的自旋分布，以及来自运行O3的前四个已发布的BBH事件。我们计算了几个独立先验的贝叶斯证据：平坦，各向同性，自旋对齐和反对齐。我们找到了所有情况下低自旋的有力证据，以及各向同性小自旋与任何其他分布的有力证据。当被视为黑洞的同质种群时，这些结果支持了LIGO /处女座黑洞为原始的观点。