An Inflow Mechanism for Hydrodynamic Entropy

TL;DR

This paper proposes a novel inflow mechanism to understand entropy production in hydrodynamics, utilizing a superspace formalism that encodes unitarity and thermal conditions through topological symmetries.

Contribution

It introduces a superspace inflow approach to hydrodynamic entropy, connecting effective actions with microscopic unitarity and thermal periodicity via BRST symmetries.

Findings

Entropy production modeled through superspace inflow.

Effective actions incorporate unitarity and thermal conditions.

Formalism provides new insights into hydrodynamic entropy mechanisms.

Abstract

We argue that entropy production in hydrodynamics can be understood via a superspace inflow mechanism. Our arguments are based on a recently developed formalism for constructing effective actions for Schwinger-Keldysh observables in quantum field theories. The formalism explicitly incorporates microscopic unitarity and the Kubo-Martin-Schwinger thermal periodicity conditions, by recasting them in terms of topological BRST symmetries of the effective action.