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arXiv 1402.6231astro-ph.CO
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天体物理学引力波背景的统计特性

Statistical properties of astrophysical gravitational-wave backgrounds

Duncan Meacher, Eric Thrane, Tania Regimbau

摘要:

我们研究如何随机引力波背景,从一组离散的天体物理源,从一个理想化的模型组成的各向同性,非极化,高斯背景不同。我们专注于,特别是,从这两种情况下产生的不同的签名,在互相关搜索中观察到的。我们表明,平均在许多实现的天体物理背景,互相关测量的天体物理背景是相同的理想化的背景。然而,任何一个天体物理背景的实现都可以产生不同的签名。使用一个模型组成的合奏的二进制中子星coalescences,我们量化的信号之间的典型差异,从个人实现的天体物理背景和理想化的情况。对于先进的探测器,我们发现,使用互相关分析,从许多离散源的天体物理背景可能是无法区分的理想化的背景。

英文摘要:

We investigate how a stochastic gravitational wave background, produced from a discrete set of astrophysical sources, differs from an idealised model consisting of an isotropic, unpolarised, and Gaussian background. We focus, in particular, on the different signatures produced from these two cases, as observed in a cross-correlation search. We show that averaged over many realisations of an astrophysical background, the cross-correlation measurement of an astrophysical background is identical to that of an idealised background. However, any one realisation of an astrophysical background can produce a different signature. Using a model consisting of an ensemble of binary neutron star coalescences, we quantify the typical difference between the signal from individual realisations of the astrophysical background and the idealised case. For advanced detectors, we find that, using a cross-correlation analysis, astrophysical backgrounds from many discrete sources are probably indistinguishable from an idealised background.

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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