Detecting a gravitational-wave background with next-generation space interferometers
Detecting a gravitational-wave background with next-generation space interferometers
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DOI：
10.1103/physrevd.73.064006
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发表时间：
2005-11
影响因子：
5
通讯作者：
H. Kudoh;A. Taruya;T. Hiramatsu;Y. Himemoto
中科院分区：
文献类型：
--
作者：
H. Kudoh;A. Taruya;T. Hiramatsu;Y. Himemoto
未来的引力波天文学任务将由天基干涉仪操作，覆盖非常广泛的频率范围。搜索随机引力波背景（GWB）是此类任务的主要目标之一，我们在此讨论直接测量（原始）GWB 频率 0.1-10 Hz 各向同性和各向异性分量的前景。在扩展相关分析的理论基础后，我们评估了拟议的未来空间干涉仪任务的灵敏度和信噪比，例如大爆炸观测器（BBO）、德西赫兹干涉仪引力波观测器（DECIGO）和最近提出的法布里-珀罗型DECIGO。低频下预期的天体物理前景可能是一个很大的障碍，并显着降低 GWB 的信噪比。因此，只要正确减去前景点源，最小可检测幅度可能达到 h^2 \ogw = 10^{-15} \sim 10^{-16}。基于相关分析，我们还讨论了 GWB 各向异性的测量。例如，我们仔细检查了检测由本地系统自行引起的 GWB 偶极矩所需的灵敏度水平。
Future missions of gravitational-wave astronomy will be operated by space-based interferometers, covering very wide range of frequency. Search for stochastic gravitational-wave backgrounds (GWBs) is one of the main targets for such missions, and we here discuss the prospects for direct measurement of isotropic and anisotropic components of (primordial) GWBs around the frequency 0.1-10 Hz. After extending the theoretical basis for correlation analysis, we evaluate the sensitivity and the signal-to-noise ratio for the proposed future space interferometer missions, like Big-Bang Observer (BBO), Deci-Hertz Interferometer Gravitational-wave Observer (DECIGO) and recently proposed Fabry-Perot type DECIGO. The astrophysical foregrounds which are expected at low frequency may be a big obstacle and significantly reduce the signal-to-noise ratio of GWBs. As a result, minimum detectable amplitude may reach h^2 \ogw = 10^{-15} \sim 10^{-16}, as long as foreground point sources are properly subtracted. Based on correlation analysis, we also discuss measurement of anisotropies of GWBs. As an example, the sensitivity level required for detecting the dipole moment of GWB induced by the proper motion of our local system is closely examined.