Ponente
Descripción
Gravitational Waves (GW) from compact binary coalescence like Black Holes or Neutron Stars behave like standard sirens and can be used to perform cosmological inference, in particular on the Hubble constant. In order to build the Hubble diagram, however, an independent measurement of the redshift is required, which is not always available. Here we propose a novel methodology which does not require knowledge of the redshift, and which is, instead, based on the calculation of the cross-correlation (cross-correlation function or cross-correlation power spectrum) between catalogs of GW events and large-area galaxy catalogs like the forthcoming Euclid.
In particular, we consider forecasts based on characteristics of future third generation GW observatories like the Einstein Telescope and Cosmic Explorers. We show that in 10 years of data-taking the achievable error on the Hubble constant is about 0.5 per cent, which is enough to solve the Hubble constant tension.
