Detecting the anisotropic astrophysical gravitational wave background in the presence of shot noise through cross-correlations

Detecting the anisotropic astrophysical gravitational wave background in the presence of shot noise through cross-correlations
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通过互相关检测散粒噪声存在下的各向异性天体物理引力波背景

DOI:
10.1103/physrevd.102.023002
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发表时间:
2020
期刊:
影响因子:
5
通讯作者:
Alonso D
Alonso D
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Alonso D

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引力波源的空间和时间离散性会导致散粒噪声,在某些情况下,散粒噪声可能会淹没任何测量引力波背景各向异性的尝试。将引力波背景图与足够密集的星系巡天进行交叉关联可以缓解这个问题,并有可能恢复引力波背景的一些基本特性。我们量化了散粒噪声水平,并明确表明,在足够的灵敏度下,引力波背景和星系目录的互相关可以提高在频率范围(10 Hz、100 Hz)下运行的引力波天文台首次检测到背景各向异性的机会。
The spatial and temporal discreteness of gravitational wave sources leads to shot noise that may, in some regimes, swamp any attempts at measuring the anisotropy of the gravitational wave background. Cross-correlating a gravitational wave background map with a sufficiently dense galaxy survey can alleviate this issue, and potentially recover some of the underlying properties of the gravitational wave background. We quantify the shot noise level and we explicitly show that cross-correlating the gravitational wave background and a galaxy catalog improves the chances of a first detection of the background anisotropy with a gravitational wave observatory operating in the frequency range (10 Hz, 100 Hz), given sufficient sensitivity.
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