Comparison of R

We use DESI DR1 BAO measurements of the ratio of tranvserse comoving distance to Hubble distance in order to test the compatibility of Rₕ=ct over flat ΛCDM. For this purpose, we used Bayesian model selection to evaluate the efficacy of these models given the observed data. When we consider the BAO measurements up to redshift of 1.3, both models are equally favored. However, when we consider the Lyman-α QSO measurement at redshift of 2.33, we find Bayes factors greater than 100 for flat ΛCDM over Rₕ=ct using two different priors for Ωm, indicating that ΛCDM is decisively favored over Rₕ=ct . The same is the case when we combine all the measurements. Therefore, the DESI DRI measurements rule out Rₕ=ct cosmology, albeit this is driven by the Lyman-α QSO measurement at z = 2.33.