Non-minimal coupling as a mechanism for spontaneous symmetry breaking on the brane

TL;DR

This paper explores how non-minimal coupling of scalar fields in braneworld models can induce spontaneous symmetry breaking on the brane, affecting the effective cosmological constant and scalar masses, but not suitable for standard model scales.

Contribution

It introduces a mechanism for spontaneous symmetry breaking via non-minimal coupling in braneworld scenarios, analyzing its effects on brane physics and limitations at standard model energies.

Findings

Non-minimal coupling induces spontaneous symmetry breaking on the brane.

The mechanism alters the effective cosmological constant and scalar masses.

It is ineffective for generating standard model scale masses.

Abstract

Motivated by the dimensional asymmetry characteristic of braneworlds, we populate the bulk spacetime with matter scalar fields, both real and complex, and couple them non-minimally to gravity. We derive the effective equations of motion on the brane and realize the case when the fields acquire a non-vanishing vacuum expectation value. This entails a change in the effective cosmological constant and in the effective mass of the scalar fields. We find that the non-minimal coupling provides a mechanism for generating spontaneous symmetry breaking at Planck energies on the brane. This mechanism is however rendered unviable for the generation of masses at the energy scales of the standard model.