We present the latest measurements of the Hubble parameter and of the parameter Ξ0 describing modified gravitational wave propagation, obtained from the third gravitational wave transient catalog, GWTC-3, using the correlation with galaxy catalogs and information from the source-frame mass distribution of binary black holes. The latter leads to the tightest bound on Ξ0 so far, i.e. Ξ0 = 1.2 +0.7−0.7 with a flat prior on Ξ0, and Ξ0 = 1.0+0.4−0.8 with a prior uniform in log Ξ0 (Max posterior and 68% HDI). The measurement of H0 is dominated by the single bright siren GW170817, resulting in H0 = 67+9−6 km s−1 Mpc when combined with the galaxy catalog.
Mancarella, M., Finke, A., Foffa, S., Genoud-Prachex, E., Iacovelli, F., Maggiore, M. (2022). Cosmology and modified gravity with dark sirens from GWTC-3. In Proceedings of the 56th Rencontres de Moriond on Gravitation (pp.101-104).
Cosmology and modified gravity with dark sirens from GWTC-3
Mancarella, Michele;
2022
Abstract
We present the latest measurements of the Hubble parameter and of the parameter Ξ0 describing modified gravitational wave propagation, obtained from the third gravitational wave transient catalog, GWTC-3, using the correlation with galaxy catalogs and information from the source-frame mass distribution of binary black holes. The latter leads to the tightest bound on Ξ0 so far, i.e. Ξ0 = 1.2 +0.7−0.7 with a flat prior on Ξ0, and Ξ0 = 1.0+0.4−0.8 with a prior uniform in log Ξ0 (Max posterior and 68% HDI). The measurement of H0 is dominated by the single bright siren GW170817, resulting in H0 = 67+9−6 km s−1 Mpc when combined with the galaxy catalog.
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