Dynamical Dark Energy and Spontaneously Generated Gravity

TL;DR

This paper investigates a scale symmetry breaking induced gravity model, showing how its dynamics can naturally lead to dark energy consistent with the universe's accelerated expansion after inflation.

Contribution

It introduces a novel induced gravity framework with a scalar field potential that explains dark energy emergence post-inflation.

Findings

The model can produce a dark energy component matching current observations.

The scalar field dynamics are influenced by the radiation-matter transition.

Conditions on the potential are identified for accelerated expansion.

Abstract

We study the cosmological evolution of an induced gravity model with a scale symmetry breaking potential for the scalar field. The radiation to matter transition, following inflation and reheating, influences the dynamics of such a field through its non minimal coupling. We illustrate how, under certain conditions on the potential, such a dynamics can lead to a suitable amount of dark energy explaining the present accelerated expansion.