Dark energy from conformal symmetry breaking

TL;DR

This paper explores how breaking conformal symmetry in a scalar-tensor gravity model could explain dark energy's origin and address the coincidence problem in cosmology.

Contribution

It demonstrates that conformal symmetry breaking can serve as a mechanism for dark energy and offers a potential solution to the coincidence problem.

Findings

Conformal symmetry breaking can generate dark energy.

The model potentially explains the coincidence problem.

The approach links symmetry breaking to cosmological acceleration.

Abstract

The breakdown of conformal symmetry in a conformally invariant scalar-tensor gravitational model is revisited in the cosmological context. Although the old scenario of conformal symmetry breaking in cosmology containing scalar field has already been used in many earlier works, it seems that no special attention has been paid for the investigation on the possible connection between the breakdown of conformal symmetry and the existence of dark energy. In this paper, it is shown that the old scenario of conformal symmetry breaking in cosmology, if properly interpreted, not only has a potential ability to describe the origin of dark energy as a symmetry breaking effect, but also may resolve the coincidence problem.