First International Latin American Conference on Gravitational Waves: 10 years since first detection

Constraining Modified Gravity with Spectral Sirens and Galaxy Catalogues.

Not scheduled

20m

Auditório Fernando de Mendonça (Instituto Nacional de Pesquisas Espaciais (INPE))

Speaker

Pedro Bessa (CBPF - Centro Brasileiro de Pesquisas Físicas)

Description

The spectral siren method is a promising new way to constrain cosmological parameters, providing a way to break the redshift degeneracy from cosmic distance measurements obtained from Gravitational Wave observations by using information from the mass distribution of the BBH population. There has been a recent development in MCMC methods to jointly constrain the cosmological and BBH population model parameters using data from both O2 and O3 runs and O4 and O5 forecasts to constrain both the standard cosmological model and parametrized deviations from LCDM using galaxy catalogues such as DESI+.

In this work, we make use of this method to directly test Modified Gravity, constraining the extra parameters of the extensively studied Hu-Sawicki f(R) gravity model. We also make use of the DESI Legacy Galaxy Catalogue, with higher sky coverage and completeness than the previous ones used in standard sirens studies, allowing us to better constrain the position of the GW events and provide a first constrain of f(R) gravity from GW siren data.