Heat exchanges in coarsening systems

TL;DR

This paper investigates heat exchanges in aging ferromagnetic systems, revealing that fast bulk modes act as an equilibrium reservoir, allowing interfaces to release heat while maintaining independent statistical properties.

Contribution

It introduces a numerical approach to analyze heat exchanges between fast and slow modes in coarsening systems, highlighting their independent statistical behaviors.

Findings

Fast modes serve as an equilibrium reservoir.

Interfaces release heat without disrupting fast modes.

Fast and slow degrees maintain statistical independence.

Abstract

This paper is a contribution to the understanding of the thermal properties of aging systems where statistically independent degrees of freedom with largely separated timescales are expected to coexist. Focusing on the prototypical case of quenched ferromagnets, where fast and slow modes can be respectively associated to fluctuations in the bulk of the coarsening domains and to their interfaces, we perform a set of numerical experiments specifically designed to compute the heat exchanges between different degrees of freedom. Our studies promote a scenario with fast modes acting as an equilibrium reservoir to which interfaces may release heat through a mechanism that allows fast and slow degrees to maintain their statistical properties independent.