A new parametrization of Hubble function and Hubble tension

TL;DR

This paper introduces a new parametrization of the Hubble function, fitting observational data to address the Hubble tension and providing results consistent with Planck 2018, thus contributing to understanding cosmic expansion discrepancies.

Contribution

A novel Hubble parameterization method validated against multiple datasets, offering a new approach to analyze the Hubble tension in cosmology.

Findings

Best-fit H0 = 67.5 km/s/Mpc, consistent with Planck 2018

Model fits observational data robustly

Highlights the persistence of Hubble tension

Abstract

We present a new Hubble parameterization method and employ observational data from Hubble, Pantheon, and Baryon Acoustic Oscillations to constrain model parameters. The proposed method is thoroughly validated against these datasets, demonstrating a robust fit to the observational data. The obtained best-fit values are $H_0 = 67.5^{+1.3}_{-1.6}$ $\text{km s}^{-1} \text{Mpc}^{-1}$, $\Omega_{\rm{m0}} = 0.2764\pm{0.0094}$, and $\alpha = 0.33\pm{0.22}$, consistent with the Planck 2018 results, highlighting the existence of Hubble tension.