Stochastic gravitational wave background anisotropies in the mHz band: astrophysical dependencies

Stochastic gravitational wave background anisotropies in the mHz band: astrophysical dependencies
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mHz 波段随机引力波背景各向异性:天体物理依赖性

DOI:
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发表时间:
2019
影响因子:
--
通讯作者:
J. Uzan
J. Uzan
中科院分区:
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文献类型:
--
作者:
G. Cusin;I. Dvorkin;C. Pitrou;J. Uzan

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我们表明,mHz 波段天体物理随机引力波背景的各向异性对星系和亚星系物理的建模有很强的依赖性。我们探索了一系列用于恒星演化和轨道参数分布的自洽天体物理模型,所有这些模型都经过校准,以便预测相同数量的已解析合并,以适应 LIGO/Virgo O1 + O2 观测运行期间的检测数量。我们表明,黑洞 (BH) 塌缩过程和 BH 质量分布中的截止过程的不同物理选择会导致各向异性的角功率谱在所有角度尺度上出现高达 50% 的分数差异。我们还指出,可以从各向异性中提取的天体物理信息与各向同性背景和个体合并是互补的。这些结果强调了人们对随机引力波背景的各向异性的兴趣,作为一个新的、潜在丰富的研究领域,处于天体物理学和宇宙学的交叉点。
We show that the anisotropies of the astrophysical stochastic gravitational wave background in the mHz band have a strong dependence on the modelling of galactic and sub-galactic physics. We explore a wide range of self-consistent astrophysical models for stellar evolution and for the distribution of orbital parameters, all calibrated such that they predict the same number of resolved mergers to fit the number of detections during LIGO/Virgo O1 + O2 observations runs. We show that different physical choices for the process of black hole (BH) collapse and cut-off in the BH mass distribution give fractional differences in the angular power spectrum of anisotropies of up to 50 per cent on all angular scales. We also point out that the astrophysical information which can be extracted from anisotropies is complementary to the isotropic background and individual mergers. These results underline the interest in the anisotropies of the stochastic gravitational wave background as a new and potentially rich field of research, at the cross-road between astrophysics and cosmology.
DOI: 10.1017/s1743921314004657
发表时间: 2012-08
期刊: Proceedings of the International Astronomical Union
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