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arXiv 1809.01401gr-qc
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用引力波观测约束黑洞自旋

Constraining black-hole spins with gravitational wave observations

Vaibhav Tiwari, Stephen Fairhurst, Mark Hannam

摘要:

观测合并黑洞双星的引力波信号,可以直接测量黑洞的性质。一个单独的观察允许测量的黑洞的质量,但只有有限的信息,无论是大小或方向的黑洞自旋是可用的,主要是由于测量之间的简并自旋和二进制质量比。利用前六个黑洞合并观测,我们能够限制黑洞自旋的分布。我们进行一组模型之间的模型选择与不同的自旋人口模型结合幂律质量分布,使自旋分布的推断。我们假设黑洞的质量分布为幂律分布,这得到了数据的支持,并提供了一个真实的二元质量比分布。这使我们能够准确地考虑由于信号幅度随自旋幅度的变化而产生的选择效应,并提供了对自旋分布的改进推断。我们得出结论,前六次LIGO和Virgo观测(Abbott et al. 2016 a,2017 a,b,c)不支持高自旋黑洞与低自旋的比值为15:1;因此,引力波观测对自旋幅度提供了强有力的约束。此外,我们能够排除具有完全对齐的自旋的双星群体,即使当单个黑洞的自旋较低时,比值比为22,000:1,显着加强了早期反对对齐自旋的证据(Farr et al. 2017)。这些结果为我们理解黑洞的形成过程提供了重要的信息。

英文摘要:

The observation of gravitational-wave signals from merging black-hole binaries enables direct measurement of the properties of the black holes. An individual observation allows measurement of the black-hole masses, but only limited information about either the magnitude or orientation of the black hole spins is available, primarily due to the degeneracy between measurements of spin and binary mass ratio. Using the first six black-hole merger observations, we are able to constrain the distribution of black-hole spins. We perform model selection between a set of models with different spin population models combined with a power-law mass distribution to make inferences about the spin distribution. We assume a fixed power-law mass distribution on the black holes, which is supported by the data and provides a realistic distribution of binary mass-ratio. This allows us to accurately account for selection effects due to variations in the signal amplitude with spin magnitude, and provides an improved inference on the spin distribution. We conclude that the first six LIGO and Virgo observations (Abbott et al. 2016a, 2017a,b,c) disfavour highly spinning black holes against low spins by an odds-ratio of 15:1; thus providing strong constraints on spin magnitudes from gravitational-wave observations. Furthermore, we are able to rule out a population of binaries with completely aligned spins, even when the spins of the individual black holes are low, at an odds ratio of 22,000:1, significantly strengthening earlier evidence against aligned spins (Farr et al. 2017). These results provide important information that will aid in our understanding on the formation processes of black-holes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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