Understand
The detection of gravitational waves (GWs) provides a direct way to measure the luminosity distance, which enables us to probe cosmology.
- In this paper, we continue to expand the application of GW standard sirens in cosmology, and propose that the spatial curvature can be estimated in a model-independent way by comparing the distances from future GW sources and current cosmic-chronometer observations.
- We expect an electromagnetic counterpart of the GW event to give the source redshift, and simulate hundreds of GW data from the coalescence of double neutron stars and black hole--neutron star binaries using the Einstein Telescope as reference.
- Our simulations show that, from 100 simulated GW events and 31 current cosmic-chronometer measurements, the error of the curvature parameter $\Omega_{K}$ is expected to be constrained at the level of $\sim0.125$.