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.
Titolo: | Dynamics of a massive intruder in a homogeneously driven granular fluid | |
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Data di pubblicazione: | 2012 | |
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Handle: | http://hdl.handle.net/20.500.12571/7997 | |
Appare nelle tipologie: | 1.1 Articolo in rivista |