# Interfaces in hot gauge theory

## TL;DR

This paper demonstrates that in hot Z(2) gauge theory, domain walls exhibit good thermodynamical behavior due to roughening, linking string tension and free energy of domain walls through a common observable.

## Contribution

It explicitly calculates the thermodynamical properties of domain walls in hot Z(2) gauge theory, revealing their good thermodynamical behavior and the connection to string tension.

## Key findings

- Domain walls in hot Z(2) gauge theory have good thermodynamical behavior.
- String tension and domain wall free energy are related through a common observable.
- Roughening of the wall indicates restoration of translational symmetry.

## Abstract

The string tension at low T and the free energy of domain walls at high T can be computed from one and the same observable. We show by explicit calculation that domain walls in hot Z(2) gauge theory have good thermodynamical behaviour. This is due to roughening of the wall, which expresses the restoration of translational symmetry.