Image Details
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 9.
Reconstructed ratio ﹩{D}_{{\rm{L}}}^{{\rm{GW}}}/{D}_{{\rm{L}}}^{{\rm{EM}}}﹩ as a function of cosmological redshift z, for the two modified-gravity parameterizations considered, Ξ0–n and αM. In both cases, the contours show the 90% CI with median (dotted curve) reconstructed from the wide H0 prior (orange) and narrow H0 prior (blue) dark siren analyses using the FULLPOP-4.0 mass model with luminosity weights. The black dashed curve represents the GR limit. Note that the reconstructed distance ratio is asymmetric at higher redshifts.
© 2026. The Author(s). Published by the American Astronomical Society.