Ultraviolet complete dark energy model

TL;DR

This paper proposes a local, ultraviolet-complete gravity model with coupled scalar fields that induces a non-local gravity action capable of explaining dark energy phenomena, aligning with observational data.

Contribution

It introduces a novel local, renormalizable gravity model with scalar fields that generates a non-local gravity action for dark energy, improving theoretical foundations.

Findings

The model induces a scalar mass above the energy scale, leading to decoupling.

Residual theory can drive accelerated expansion under certain conditions.

The generated non-local action fits dark energy observational data.

Abstract

We consider a local phenomenological model to explain a non-local gravity scenario which has been proposed to address dark energy issues. This non-local gravity action has been seen to fit the data as well as $\Lambda$-CDM and therefore demands a more fundamental local treatment. The induced gravity model coupled with higher-derivative gravity is exploited for this proposal, as this perturbatively renormalizable model has a well-defined ultraviolet (UV) description where ghosts are evaded. We consider a generalised version of this model where we consider two coupled scalar fields and their non-minimal coupling with gravity. In this simple model, one of the scalar field acquires a Vacuum Expectation Value (VEV), thereby inducing a mass for one of the scalar fields and generating Newton's constant. The induced mass however is seen to be always above the running energy scale thereby leading to its decoupling. The residual theory after decoupling becomes a platform for driving the accelerated expansion under certain conditions. Integrating out the residual scalar generates a non-local gravity action. The leading term of which is the non-local gravity action used to fit the data of dark energy.