Dark Energy Regulation with Approximate Emergent Conformal Symmetry

TL;DR

This paper proposes a scalar-tensor gravity model with an approximate emergent conformal symmetry that regulates dark energy, preventing vacuum energy from contributing to cosmic acceleration.

Contribution

It introduces a novel cosmic potential within scalar-tensor gravity that suppresses vacuum energy effects during a specific symmetry phase.

Findings

Dark energy is regulated to the order of a conformal anomaly parameter.

Vacuum energy from matter Lagrangian does not affect dark energy during the symmetry phase.

The model provides a mechanism for relaxing the cosmological constant problem.

Abstract

A cosmic potential which can relax the vacuum energy is proposed in a framework of scalar-tensor gravity. In the phase of the gravity scalar field around the evolution with an approximate emergent conformal symmetry, we have obtained a set of cosmological equations with the dark energy regulated to the order of a conformal anomaly parameter. Through a role of the cosmic potential, the vacuum energy which could be generated in matter Lagrangian does not contribute to the dark energy in the phase.