利用引力波和星系目录的角度交叉相关进行宇宙学推演：面向下一代干涉仪与 Euclid 调查的预测

我们研究了引力波和星系目录在作象红移和距离箱体中的角功率谱，作为探测后时宇宙学的手段，特别关注下一代基于地面的干涉仪结合 Euclid 光度测绘。我们评估了该技术约束哈勃常数和物质能量密度的潜力。我们的分析包含真实的引力波源人口、在最近探测器设计上校准的误差模型，并考虑了噪声参数。我们显示， Depending on the binning choice, configuration and operation time of gravitational-wave observatories, the tomographic angular cross-correlation could determine the Hubble constant to percent or sub-percent precision. This conclusion holds even when marginalising over the unknown tracer biases, primordial power-spectrum parameters and baryon density. In particular, we show that the combination of the galaxy auto-correlation spectra and the cross-correlation of gravitational waves and galaxy surveys can lead to an improvement of up to a factor ${{\sim}}10$ in constraining power over either of the two probes taken individually. However, this prospect crucially relies on the presence of multiple gravitational-wave interferometers able to yield precise sky localisation. We also discuss the use of a spectroscopic redshift catalog, as well as the detectability of the clustering bias of gravitational-wave sources.