  We discuss the power of third-generation gravitational wave detectors to
constrain cosmographic parameters in the case of electromagnetically bright
standard sirens focusing on the specific case of the Einstein Telescope. We
analyze the impact that the redshift source distribution, the number of
detections and the observational error in the luminosity distance have on the
inference of the first cosmographic parameters, and show that with a few
hundreds detections the Hubble constant can be recovered at sub-percent level
whereas the deceleration parameter at a few percent level, both with negligible
bias.

General Relativity and Quantum Cosmology;Cosmology and Nongalactic Astrophysics