CSST and Gravitational Waves: Mapping the Cosmos

This paper explores the potential of cross-correlating gravitational wave (GW) events detected by third-generation (3G) ground-based GW detectors with the photometric redshift survey of the China Space Station Survey Telescope (CSST). The core idea is that GW events, originating in galaxies, can serve as tracers of the universe's large-scale structure. By cross-correlating these events with galaxies, a correspondence between luminosity distance and redshift shells can be established, enabling cosmological inference. The study finds that the constraint precisions of the Hubble constant and the matter density parameter can reach 1.04% and 2.04%, respectively. Additionally, the precision of the GW clustering bias parameter can also be constrained.

The success of this approach relies on the synergy between GW astronomy and traditional electromagnetic observations. The CSST provides a wealth of photometric redshift data, while 3G GW detectors offer precise measurements of luminosity distances. By combining these two datasets, researchers can overcome the mass-redshift degeneracy inherent in GW observations and obtain independent constraints on cosmological parameters. This method is particularly valuable because it does not rely on a specific cosmological model.

The implications of this research are significant for our understanding of the universe's expansion and evolution. Improving the precision of cosmological parameters like the Hubble constant is crucial for resolving the Hubble tension and testing the standard cosmological model. Furthermore, this synergy between GW astronomy and traditional telescopes opens up new avenues for probing GW source formation channels and exploring the nature of dark energy.

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