论文标题
LIGO二进制黑洞的分支比率
The branching ratio of LIGO binary black holes
论文作者
论文摘要
通过重力波（GW）检测到的二进制黑洞（BBH）的形成可以大致分为两类：通过田间二进制进化形成的观测，以及在密集的恒星系统中动态组装的那些。 BBHS的分支比率是指每个通道的贡献。动力组装通道将预测BBHS有效旋转中的对称分布，而田间形成预测BBHS具有阳性有效旋转。通过基于其有效自旋分布的这两个群体进行建模，我们表明，在Ligo/Pirgo检测到的10个BBH中，动态组装的BBHS的贡献超过50 \％，并具有90 \％的置信度。该结果是基于以下假设：野外二进制物天生具有阳性有效的旋转不限于具有较小值的假设。
Formation of binary black holes (BBHs) detected by gravitational-wave (GW) observations could be broadly divided into two categories: those formed through field binary evolution and those assembled dynamically in dense stellar systems. The branching ratio of the BBHs refers to the contribution of each channel. The dynamical assembly channel would predict a symmetric distribution in the effective spins of the BBHs while field formation predicts BBHs to have positive effective spins. By modeling these two populations based on their effective spin distribution we show that in the 10 BBHs detected by LIGO/Virgo the contribution of the dynamically assembled BBHs to be more than about 50\% with 90\% confidence. This result is based on the assumption that the field binaries are born with positive effective spins not restricted to have small values.
