论文标题
寻找各向异性随机重力波背景，并具有空间基础干涉仪的星座
Searching for anisotropic stochastic gravitational-wave backgrounds with constellations of space-based interferometers
论文作者
论文摘要
最近的许多作品表明，地面检测器的角度分辨率太差，无法表征随机重力波背景（SGWB）的各向异性。因此，我们问自己是否可以更合适。我们考虑激光干涉仪空间天线（LISA），一个类似Lisa的簇的星座以及Deci-Hertz干涉仪重力波观测站（Decigo）。具体而言，我们测试这些检测器星座是否可以探测SGWB的各向异性。对于此范围，我们考虑了两个天体物理来源产生的SGWB：合并紧凑的二进制文件和最近提出的通过多次恒星残余物通过的合并来构成大规模黑洞形成的场景。我们发现，测量SGWB各向异性的角度功率谱几乎无法实现。但是，事实证明，可以通过与CMB波动互相关来探测SGWB各向异性。特别地，我们发现两个类似Lisa的检测器和CMB-S4的星座可以略微限制CMB透镜收敛与黑洞种子形成过程产生的SGWB之间的互相关。此外，我们发现Decigo可以通过合并紧凑型二进制文件来探测CMB镜头与SGWB之间的互相关。
Many recent works have shown that the angular resolution of ground-based detectors is too poor to characterize the anisotropies of the stochastic gravitational-wave background (SGWB). For this reason, we asked ourselves if a constellation of space-based instruments could be more suitable. We consider the Laser Interferometer Space Antenna (LISA), a constellation of multiple LISA-like clusters, and the Deci-hertz Interferometer Gravitational-wave Observatory (DECIGO). Specifically, we test whether these detector constellations can probe the anisotropies of the SGWB. For this scope, we considered the SGWB produced by two astrophysical sources: merging compact binaries and a recently proposed scenario for massive black-hole seed formation through multiple mergers of stellar remnants. We find that measuring the angular power spectrum of the SGWB anisotropies is almost unattainable. However, it turns out that it could be possible to probe the SGWB anisotropies through cross-correlation with the CMB fluctuations. In particular, we find that a constellation of two LISA-like detectors and CMB-S4 can marginally constrain the cross-correlation between the CMB lensing convergence and the SGWB produced by the black hole seed formation process. Moreover, we find that DECIGO can probe the cross-correlation between the CMB lensing and the SGWB from merging compact binaries.
