Forecast for cosmological parameter estimation with gravitational-wave
  standard siren observation from the Cosmic Explorer
  The third-generation ground-based gravitational-wave (GW) detector, Cosmic
Explorer (CE), is scheduled to start its observation in the 2030s. In this
paper, we make a forecast for cosmological parameter estimation with
gravitational-wave standard siren observation from the CE. We use the simulated
GW standard siren data of CE to constrain the $\Lambda$CDM, $w$CDM and CPL
models. We combine the simulated GW data with the current cosmological
electromagnetic observations including the latest cosmic microwave background
anisotropies data from Planck, the optical baryon acoustic oscillation
measurements, and the type Ia supernovae observation (Pantheon compilation) to
do the analysis. We find that the future standard siren observation from CE
will improve the cosmological parameter estimation to a great extent, since the
future GW standard siren data can well break the degeneracies generated by the
optical observations between various cosmological parameters. We also find that
the CE's constraining capability on the cosmological parameters is slightly
better than that of the same-type GW detector, the Einstein Telescope. In
addition, the synergy between the GW standard siren observation from CE and the
21 cm emission observation from SKA is also discussed.
