DE Models with Combined <i>H</i>₀ · <i>r</i>_d from BAO and CMB Dataset and Friends

Abstract

It has been theorized that dynamical dark energy (DDE) could be a possible solution to Hubble tension. To avoid degeneracy between Hubble parameter H0 and sound horizon scale rd, in this article, we use their multiplication as one parameter c/H0rd, and we use it to infer cosmological parameters for 6 models—ΛCDM and 5 DDE parametrizations—the Chevallier–Polarski–Linder (CPL), the Barboza–Alcaniz (BA), the low correlation (LC), the Jassal–Bagla–Padmanabhan (JBP) and the Feng–Shen–Li-Li models. We choose a dataset that treats this combination as one parameter, which includes the baryon acoustic oscillation (BAO) data 0.11≤z≤2.40 and additional points from the cosmic microwave background (CMB) peaks (z≃1090). To them, we add the marginalized Pantheon dataset and GRB dataset. We see that the tension is moved from H0 and rd to c/H0rd and Ωm. There is only one model that satisfies the Planck 2018 constraints on both parameters, and this is LC with a huge error. The rest cannot fit into both constraints. ΛCDM is preferred, with respect to the statistical measures.

Keywords

• cosmological tensions
• dynamical dark energy
• baryon acoustic oscillation
• Pantheon dataset
• gamma-ray bursts