What question did this study set out to answer?

The aim is to analyze shared-parameter contributions in cosmological models to understand the H0 tension better.

April 28, 2026Open Access

Multi-probe decomposition of shared-parameter contributions in cosmological inference: implications for the H0 tension

Key Points

The aim is to analyze shared-parameter contributions in cosmological models to understand the H0 tension better.
Utilized multi-probe decomposition involving CMB, BAO, and Type Ia supernovae.
Employed M-marginalised likelihood structure for statistical evaluations.
Calculated Delta-chi-squared, Delta-AIC, and Delta-BIC values to compare joint fits.
Reported Delta-chi-squared = 279, strongly favoring the EB-corrected joint fit.
Delta-AIC = -277 and Delta-BIC = -272 indicating model preference.
H0 estimated at 63.9 km/s/Mpc as a diagnostic figure.

Abstract

MNRAS submission MN-26-1197-P. Reports the multi-probe decomposition of shared-parameter contributions across CMB, BAO, and Type Ia supernovae, with M-marginalised likelihood structure delivering Delta-chi-squared = 279, Delta-AIC = -277, Delta-BIC = -272 in favour of the EB-corrected joint fit over the standard one. Reports H0 = 63.9 km/s/Mpc as a diagnostic, not a measurement, with the Section 6.1 framing distinguishing three readings of the result. Submitted 2026-04-25 to MNRAS.

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