Constraining the Hubble constant and modified GW propagation with LIGO/Virgo dark sirens

We apply a statistical method for constraining the Hubble parameter and modified Gravitational Wave (GW) propagation by correlating “dark sirens” (i.e. compact binary coalescences without an electromagnetic counterpart) with galaxy catalogs to the GWTC-2 catalogue and the GLADE galaxy catalogue. We propose various methodological improvements to the state of the art and discuss several sources of systematic uncertainty. We give an updated bound on H0 and the first bounds on the modified GW propagation parameter Ξ0 from dark sirens alone.