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Forecasts for cosmological parameters through Einstein Telescope standard sirens
* 1, 2 , 3 , 1, 2, 4 , 1, 2, 4
1  Scuola Superiore Meridionale - Napoli
2  INFN Sezione di Napoli
3  Universidad de Salamanca
4  University of Naples "Federico II"
Academic Editor: Lorenzo Iorio

Published: 16 February 2023 by MDPI in 2nd Electronic Conference on Universe session Gravitation and Cosmology

Gravitational Wave (GW) astronomy provides an independent way to estimate cosmological parameters. The detection of GWs from a coalescing binary allows a direct measurement of its luminosity distance, so these sources are referred to as "standard sirens" in analogy to standard candles. In this talk, I investigate the impact of the Einstein Telescope, a third-generation detector which will detect tens of thousands of binary neutron stars. I focus on the non-flat CDM cosmology and some Dark Energy models. To evaluate the accuracy of cosmological parameters, I consider two types of mock datasets depending on whether or not a short Gamma-Ray Burst is detected and associated with the gravitational wave event using the THESEUS satellite. Depending on the mock dataset, different statistical estimators are applied: one assumes that the redshift is known, and another marginalizes over it, taking a specific prior distribution.

Keywords: cosmological parameters; gravitational waves; neutron star mergers; Einstein Telescope