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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 5.
Left panel: Hubble constant posteriors with the dark siren method using the GLADE+ K band, assuming three different mass models in the luminosity-weighting case: PLP (magenta curve), MLTP (gold curve), and FULLPOP-4.0 (blue curve). See Section 2.3 and Appendix C for definitions of these models. Right panel: Hubble constant posteriors with the dark siren analysis in the no-weighting and luminosity-weighted schemes for host galaxies (blue dashed and solid curves, respectively), using the FULLPOP-4.0 mass model. See Section 2.2 for details of the galaxy-weighting scheme. In both panels, the pink and green shaded areas identify the 68% CI constraints on H0 inferred, respectively, from CMB anisotropies (P. A. R. Ade et al. 2016) and in the local Universe from SH0ES (A. G. Riess et al. 2022).
© 2026. The Author(s). Published by the American Astronomical Society.