Can scale-dependent cosmology alleviate the $H_0$ tension?

TL;DR

This paper explores a scale-dependent gravity model as a potential solution to the H_0 tension, demonstrating through numerical analysis that it can alleviate discrepancies between early and late universe measurements.

Contribution

It introduces a scale-dependent cosmological model that modifies the ΛCDM framework and shows it can reduce the H_0 tension through parameter space analysis.

Findings

The model can relax the H_0 tension.

Numerical scans identify parameter regions that alleviate the tension.

Scale dependence offers a promising avenue for resolving cosmological discrepancies.

Abstract

Scale-dependence is a common feature to all effective models of quantum gravity. In this paper, a cosmological model based on the scale-dependent scenario of gravity is presented. It is argued that such models, where the scale-dependence appears as a correction to the classical $\Lambda$CDM evolution, have the potential of addressing the tensions between early and late time measurements of $H_0$. After defining criteria to parametrize this tension, we perform a numerical scan over the parameter space of the scale-dependent model, subject to these criteria. In this analysis, it is found that, indeed, the tension can be released.