论文标题
两个Ligo-Virgo黑洞的种群
Two populations of LIGO-Virgo black holes
论文作者
论文摘要
我们分析了包括最近发布的GWTC-2数据集在内的Ligo-Virgo数据，以测试数据包含一个以上的黑洞人群的假设。我们进行最大似然分析，包括具有截短的幂律质量功能的天体物理黑洞的人群，其合并率遵循恒星形成率，以及原始黑洞的种群，我们认为我们认为对数正态和临界崩溃质量功能。我们发现，单独的原始黑洞被数据强烈分歧，而对于结合天体物理和原始合并率的模板获得了最佳拟合。或者，数据可能暗示两个不同的天体物理黑洞人群。我们还从Ligo-Virgo观察结果中更新了原始黑洞丰度的限制，发现在$ 2-400m_ \ odot $质量范围内，它们必须占暗物质的0.2％。
We analyse the LIGO-Virgo data, including the recently released GWTC-2 dataset, to test a hypothesis that the data contains more than one population of black holes. We perform a maximum likelihood analysis including a population of astrophysical black holes with a truncated power-law mass function whose merger rate follows from star formation rate, and a population of primordial black holes for which we consider log-normal and critical collapse mass functions. We find that primordial black holes alone are strongly disfavoured by the data, while the best fit is obtained for the template combining astrophysical and primordial merger rates. Alternatively, the data may hint towards two different astrophysical black hole populations. We also update the constraints on primordial black hole abundance from LIGO-Virgo observations finding that in the $2-400M_\odot$ mass range they must comprise less than 0.2% of dark matter.
