Dynamics of a massive intruder in a homogeneously driven granular fluid

Abstract

A massive intruder in a homogeneously driven granular fluid, in dilute configurations, performs a memory-less Brownian motion with drag and temperature simply related to the average density and temperature of the fluid. At volume fraction $\sim 10-50$ the intruder's velocity correlates with the local fluid velocity field: such situation is approximately described by a system of coupled linear Langevin equations equivalent to a generalized Brownian motion with memory. Here one may verify the breakdown of the Fluctuation-Dissipation relation and the presence of a net entropy flux - from the fluid to the intruder - whose fluctuations satisfy the Fluctuation Relation.

6 pages, 2 figures, to be published on "Granular Matter" in a special issue in honor of the memory of Prof. Isaac Goldhirsch

References in corpus (6)

• Forcing and Velocity Correlations in a Vibrated Granular Monolayer
• Fluctuation-Dissipation relations in Driven Granular Gases
• Granular Brownian motion
• Dynamics of a tracer granular particle as a non-equilibrium Markov process
• Dynamics of a hard sphere granular impurity
• On the Einstein relation in a heated granular gas