Boson metastable ground states with spontaneous symmetry breaking

TL;DR

This paper demonstrates that boson systems at zero temperature can have metastable ground states with spontaneous symmetry breaking without imaginary mass terms, offering new insights for various physics fields.

Contribution

It introduces a novel mechanism for metastable ground states in boson systems without imaginary mass, expanding understanding of symmetry breaking.

Findings

Boson systems can exhibit metastable states at T=0.

Spontaneous symmetry breaking occurs without imaginary mass terms.

Potential applications in cosmology, condensed matter, and high energy physics.

Abstract

We show that a system of bosons in a T=0 quantum field theory can present metastable ground states with spontaneous symmetry breaking, even in the absence of an imaginary mass term. This gives a natural explanation to the Davis-Shellard background field \exp(-i \omega_0 t) and adds a new degree of freedom in boson systems, with possible applications in cosmology, condensed matter and high energy physics.