Symmetry Breaking at All Temperatures

Phys Rev Lett. 2020 Sep 25;125(13):131603. doi: 10.1103/PhysRevLett.125.131603.

Abstract

We explore the existence of conformal field theories that persistently break a global symmetry at finite temperature. We identify vector models in (3-ε) spatial dimensions that have internal symmetries broken at any temperature. We study these systems in the small ε regime and in the large rank limit. The latter displays a conformal manifold and a moduli space of vacua deformed at finite temperature. We touch upon a candidate in d=2 dimensions.