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GWTC-4.0: Constraints on the Cosmic Expansion Rate and Modified Gravitational-wave Propagation
A. G. Abac et al 2026 The Astrophysical Journal Letters 1007 .
Caption: Figure 4.
Hubble constant posterior for different cases. Yellow curve: posterior obtained from the bright siren GW170817 and its EM counterpart. Orange curve: posterior obtained with the spectral siren method and the FULLPOP-4.0 mass model. Blue curve: posterior obtained using all dark sirens with GLADE+ K band in the luminosity-weighting case (ϵ = 1) and the FULLPOP-4.0 mass model. Black curve: posterior after combining the dark and bright siren results. The pink and green shaded areas identify the 68% CI constraints on H0 inferred from CMB anisotropies (P. A. R. Ade et al. 2016) and in the local Universe from SH0ES (A. G. Riess et al. 2022), respectively.
© 2026. The Author(s). Published by the American Astronomical Society.