Preferred-frame Effects, the $H_0$ Tension, and Probes of Ho\v{r}ava-Lifshitz Gravity

TL;DR

This paper explores how preferred-frame effects in Hořava-Lifshitz gravity could influence the H0 tension, using observational data to constrain model parameters and suggesting Lorentz-violating effects may account for up to 38% of the tension.

Contribution

It provides new observational constraints on Hořava-Lifshitz gravity parameters and links preferred-frame effects to the H0 tension.

Findings

Preferred-frame effects can explain up to 38% of the H0 tension.

New constraints on the model parameter λ in Hořava-Lifshitz gravity.

Lorentz-violating effects are significant in cosmological dynamics.

Abstract

We discuss implications on the $H_0$ tension due to preferred-frame effects in the context of Ho\v{r}ava-Lifshitz gravity. By using a combination of low-redshift data (Sne1a, elliptical and lenticular galaxies, GRB's, and quasars) we study the $H_0$ tension and its appearance as a preferred-frame effect, as well as present new constraints on the model parameter $\lambda$. Moreover, from the structure of the Friedmann equations, we argue that up to $38\%$ of the Hubble tension can be explained by Lorentz-violating effects in a Ho\v{r}ava-Lifshitz scenario.