论文标题
交叉相关的星系目录和引力波:一种层析成像方法
Cross-correlating galaxy catalogs and gravitational waves: a tomographic approach
论文作者
论文摘要
揭示通过重力波(GW)检测到的合并二进制文件的起源是具有挑战性的,尤其是如果未检测到多波长对应物。一个重要的诊断工具是相对于宇宙的大规模结构(LSS)的二元分布,我们通过与GW的星系目录的互相关进行量化。通过使用现有和即将出现的GARAXY目录并使用现实的GW事件的蒙特卡洛模拟,我们发现,在为二进制中子星级合并时至少应以设计敏感性的高级Ligo-Virgo探测器的10年数据中,互相关信号应略微检测到。预期将Kagra和Ligo-India添加到GW检测器网络中,将允许对该信号进行更牢固的检测,并结合未来的宇宙学调查,还将允许检测与黑洞融合的互相关。这样的测量可能会揭示出融合黑洞的原始起源。为了实现这一目标,我们发现采用层析成像方法并达到足够准确的GW事件定位至关重要。即将进行的调查的深度将由第三代GW探测器(例如爱因斯坦望远镜或宇宙资源管理器)充分利用,这将使人们可以对合并的黑洞LSS分布进行精确研究,并获得相当高级的模型歧视能力。
Unveiling the origin of the coalescing binaries detected via gravitational waves (GW) is challenging, notably if no multi-wavelength counterpart is detected. One important diagnostic tool is the coalescing binary distribution with respect to the large scale structures (LSS) of the universe, which we quantify via the cross-correlation of galaxy catalogs with GW ones. By using both existing and forthcoming galaxy catalogs and using realistic Monte Carlo simulations of GW events, we find that the cross-correlation signal should be marginally detectable in a 10-year data taking of advanced LIGO-Virgo detectors at design sensitivity, at least for binary neutron star mergers. The expected addition of KAGRA and LIGO-India to the GW detector network would allow for a firmer detection of this signal and, in combination with future cosmological surveys, would also permit the detection of cross-correlation for coalescing black holes. Such a measurement may unveil, for instance, a primordial origin of coalescing black holes. To attain this goal, we find that it is crucial to adopt a tomographic approach and to reach a sufficiently accurate localization of GW events. The depth of forthcoming surveys will be fully exploited by third generation GW detectors such as the Einstein Telescope or the Cosmic Explorer, which will allow one to perform precision studies of the coalescing black hole LSS distribution and attain rather advanced model discrimination capabilities.