Constraints on the Cosmic Expansion History from GWTC–3

Abstract We use 47 gravitational wave sources from the Third LIGO–Virgo–Kamioka Gravitational Wave Detector Transient Catalog (GWTC–3) to estimate Hubble parameter H ( z ), including its current value, constant 0 . Each (GW) signal provides luminosity distance source, and we corresponding redshift using two methods: redshifted masses a galaxy catalog. Using binary black hole (BBH) masses, simultaneously infer source mass distribution ). The displays peak around 34 M ⊙ , followed by drop-off. Assuming this scale does not evolve with results in ) measurement, yielding H 0 = 68 − 8 + 12 km width="0.33em" width="0.25em" s 1 Mpc (68% credible interval) when combined measurement GW170817 electromagnetic counterpart. This represents an improvement of 17% respect GWTC–1. second method associates each GW event probable host catalog GLADE+ statistically marginalizing over redshifts event’s potential hosts. fixed BBH population, value ${H}_{0}={68}_{-6}^{+8}\,\mathrm{km}\ 6 method, 42% our GWTC–1 result 20% recent studies GWTC–2 events. However, show that is strongly impacted assumptions about distribution; only which such (and thus informative well-localized GW190814.