Comparison of $Λ$CDM and $R_h = ct$ with updated galaxy cluster $f_{gas}$ measurements using Bayesian inference

Kunj Panchal; Shantanu Desai

doi:10.1016/j.jheap.2024.06.003

paper

Comparison of $Λ$ CDM and $R_{h} = c t$ with updated galaxy cluster $f_{g a s}$ measurements using Bayesian inference

arXiv:2401.11138 · doi:10.1016/j.jheap.2024.06.003

Abstract

We use updated gas mass fraction measurements of 44 massive dynamically relaxed galaxy clusters collated in arXiv:2111.09343 to distinguish between the standard $Λ$ CDM model and $R_{h} = c t$ universe. For this purpose, we use Bayesian model selection to compare the efficacy of both these cosmological models given the data. The gas mass fraction is modeled using both cosmology-dependent terms and also astrophysical parameters, which account for the variation with cluster mass and redshift. We used two different prior choices for some of the astrophysical parameters. We find a Bayes factors of 50 and 5 for $Λ$ CDM as compared to $R_{h} = c t$ for these two prior choices. This implies that $Λ$ CDM is favored compared to $R_{h} = c t$ with significance ranging from substantial to very strong.

arXiv comment8 pages. Accepted for publication in JHEAP

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Bayesian Model Comparison of $R_{h} = c t$ versus $Λ$ CDM using HII galaxy Hubble diagram

Comparison of ΛCDM and Rh​=ct with updated galaxy cluster fgas​ measurements using Bayesian inference

Abstract

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Comparison of $Λ$ CDM and $R_{h} = c t$ with updated galaxy cluster $f_{g a s}$ measurements using Bayesian inference