Full-order fluctuation-dissipation relation for a class of non-equilibrium steady states

TL;DR

This paper derives a full-order fluctuation-dissipation relation for certain non-equilibrium steady states, linking heat fluctuations in equilibrium to responses under nonconservative forces without linear approximation.

Contribution

It introduces a novel fluctuation-dissipation relation for non-equilibrium steady states based on heat fluctuation analysis, extending beyond linear response.

Findings

Relation connects heat fluctuations to system response.

Nonconservative forces relate to large deviations of heat.

Derived fluctuation-dissipation relation without linear approximation.

Abstract

Acceleration of relaxation toward a fixed stationary distribution via violation of detailed balance was reported in the context of a Markov chain Monte Carlo method recently. Inspired by this result, systematic methods to violate detailed balance in Langevin dynamics were formulated by using exponential and rotational nonconservative forces. In the present paper, we accentuate that such specific nonconservative forces relate to the large deviation of total heat in an equilibrium state. The response to these nonconservative forces can be described by the intrinsic fluctuation of the total heat in the equilibrium state. Consequently, the fluctuation-dissipation relation for nonequilibrium steady states is derived without recourse to a linear response approximation.