A Dark Energy model from Generalized Proca Theory

TL;DR

This paper explores a cubic-order generalized Proca dark energy model that fits cosmological data well and alleviates the Hubble tension, suggesting it as a promising alternative to standard models.

Contribution

It introduces a specific cubic-order generalized Proca dark energy model and demonstrates its compatibility with observational data, addressing the Hubble tension.

Findings

Hubble constant around 71.8 km/s/Mpc with CMB data

Model fits data with reduced chi-squared close to unity

Alleviates the Hubble tension problem

Abstract

We consider a specific dark energy model, which only includes the Lagrangian up to the cubic order in terms of the vector field self-interactions in the generalized Proca theory. We examine the cosmological parameters in the model by using the data sets of CMB and CMB+HST, respectively. In particular, the Hubble constant is found to be $H_0=71.80^{+1.07}_{-0.72}$ ($72.48^{+0.72}_{-0.60}$) $\rm kms^{-1}Mpc^{-1}$ at $68\%$~C.L. with CMB (CMB+HST), which would alleviate the Hubble constant tension. We also obtain that the reduced $\chi^2$ values in our model are close to unity when fitting with CMB and CMB+HST, illustrating that our model is a good candidate to describe the cosmological evolutions of the universe.