2022/03/21 by K. Leyde, S. Mastrogiovanni, Leyde, Konstantin +7 · 2 citations
Earth and Planetary Sciences · Physics and Astronomy · #Cosmology and Gravitation Theories #FOS: Physical sciences #General Relativity and Quantum Cosmology (gr-qc) #Geophysics and Gravity Measurements #High Energy Astrophysical Phenomena (astro-ph.HE) #Pulsars and Gravitational Waves Research #Relativity and Gravitational Theory
paper · pdf · doi:10.48550/arxiv.2203.11680
openalex created_date 2022/02/25 · openalex publication_date 2022/03/21 · openalex updated_date 2026/07/28
In this proceedings, we are interested in dark gravitational wave standard sirens and their use for cosmology and for constraining modified gravity theories. Due to the extra friction term introduced in their propagation equation those theories predict different luminosity distances for electromagnetic and gravitational waves (GWs). This effect can be parametrized by the two variables Ξ0 and n, that can be measured from gravitational wave observations, and specifically from the binary black hole (BBH) mergers detected by LIGO and Virgo. By fitting jointly BBH population models in mass and redshift, the cosmological parameters, and the modified GW luminosity distance to ∼ 60 signals observed during the first three LIGO/Virgo observation runs, we conclude that general relativity is consistently the preferred model. The future observation runs O4 and O5 are also considered. Using the same approach, we forecast a measurement uncertainty on the modified gravity parameter Ξ0 of 51% with O4, and 20% with O4 and O5, respectively if GR is the correct theory of gravity. However, we underline that there are strong correlations between astrophysical, cosmological and modified gravity parameters, possibly leading to bias if wrong priors are assumed.