Decomposition of force fluctuations far from equilibrium

Abstract

By studying a nonequilibrium Langevin system, we find that a simple condition determines the decomposition of the coarse-grained force into a dissipative force, an effective driving force and noise. From this condition, we derive a new universal inequality, $D \ge γ\mud^2 T$, relating the diffusion constant $D$, the differential mobility $\mud$, the bare friction constant $\gamma$ and the temperature $T$. Due to the general nature of the argument we present, we believe that our idea concerning this decomposition can be applied to a wide class of systems far from equilibrium.

4 pages

References in corpus (4)

• Macroscopic fluctuation theory for stationary non equilibrium states
• Violation of the fluctuation-dissipation theorem in glassy systems: basic notions and the numerical evidence
• Large Force Fluctuations in a Flowing Granular Medium
• Effective temperature in nonequilibrium steady states of Langevin systems with a tilted periodic potential

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