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 ~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. © Springer-Verlag 2012.

Dynamics of a massive intruder in a homogeneously driven granular fluid

Sarracino, A.;
2012

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 ~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. © Springer-Verlag 2012.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11591/398941
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