Statistical properties of astrophysical gravitational-wave backgrounds
Statistical properties of astrophysical gravitational-wave backgrounds
复制标题
天体物理引力波背景的统计特性
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
T. Regimbau
中科院分区：
文献类型：
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作者：
D. Meacher;E. Thrane;T. Regimbau
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，对天体物理背景的任何一种认识都可能产生不同的特征。使用一个模型组成的合奏的二进制中子星星聚结，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下。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。
We investigate how a stochastic gravitational-wave background, produced from a discrete set of astrophysical sources, differs from an idealized model consisting of an isotropic, unpolarized, 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 realizations of an astrophysical background, the cross-correlation measurement of an astrophysical background is identical to that of an idealized background. However, any one realization 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 realizations of the astrophysical background and the idealized case. For advanced detectors, we find that, using a cross-correlation analysis, astrophysical backgrounds from many discrete sources are probably indistinguishable from an idealized background.