Fluctuations in partitioning systems with few degrees of freedom

Fluctuations in partitioning systems with few degrees of freedom

We study the behavior of a moving wall in contact with a particle gas and subjected to an external force. We compare the fluctuations of the system observed in the microcanonical and canonical ensembles, at varying the number of particles. Static and dynamic correlations signal significant differenc...

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Veröffentlicht in:arXiv.org 2014-03
Hauptverfasser: Cerino, L, Gradenigo, G, Sarracino, A, Villamaina, D, Vulpiani, A
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Moving walls
Partitioning
Physics - Statistical Mechanics
Variation
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creator Cerino, L
Gradenigo, G
Sarracino, A
Villamaina, D
Vulpiani, A
description We study the behavior of a moving wall in contact with a particle gas and subjected to an external force. We compare the fluctuations of the system observed in the microcanonical and canonical ensembles, at varying the number of particles. Static and dynamic correlations signal significant differences between the two ensembles. Furthermore, velocity-velocity correlations of the moving wall present a complex two-time relaxation which cannot be reproduced by a standard Langevin-like description. Quite remarkably, increasing the number of gas particles in an elongated geometry, we find a typical timescale, related to the interaction between the partitioning wall and the particles, which grows macroscopically.
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subjects Moving walls
Partitioning
Physics - Statistical Mechanics
Variation
title Fluctuations in partitioning systems with few degrees of freedom
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