Resolving the Hubble Constant Tension with CSST and Gravitational Wave Dark Standard Sirens

The Hubble constant (H0) tension is a well-known issue in cosmology, arising from the inconsistency between H0 values derived from the cosmological model constrained by CMB anisotropies measurements and other astrophysical data, and direct measurements obtained via the cosmic distance ladder. To resolve this discrepancy, new cosmological probes are needed to provide independent measurements, with gravitational-wave (GW) dark standard sirens being one such promising tool. This presentation highlights recent research exploring the use of a mock galaxy catalog from the China Space Station Telescope (CSST) in conjunction with simulated dark standard siren data from the next generation of ground-based GW detectors to infer H0. The findings demonstrate that the synergy between CSST and GW data allows for an accurate H0 measurement with an error of less than 1%, potentially arbitrating the H0 tension. Furthermore, the study investigates the impact of different cosmological parameters on the H0 measurement using CSST+GW data, revealing that the degeneracy between H0 and other parameters can be broken with the inclusion of GW data. This highlights the potential of GW dark standard sirens as a powerful cosmological probe, not only for addressing the H0 tension but also for constraining other cosmological parameters. In summary, this research showcases the capability of combining the CSST galaxy catalog with GW dark standard siren data to provide an independent and accurate measurement of H0, contributing to the resolution of the H0 tension in cosmology. It also emphasizes the potential of GW dark standard sirens as a powerful tool for constraining other cosmological parameters.