Fluctuations in partitioning systems with few degrees of freedom

被引：9

作者：

Cerino, L. ^{[1
]}

Gradenigo, G. ^{[2
,3
]}

Sarracino, A. ^{[4
,5
,6
,7
]}

Villamaina, D. ^{[8
,9
]}

Vulpiani, A. ^{[5
,6
,10
]}

机构：

[1] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[2] CEA Saclay, URA 2306, CNRS, CEA,DSM, F-91191 Gif Sur Yvette, France

[3] Univ Paris 11, LPTMS, CNRS, UMR 8626, F-91405 Orsay, France

[4] Univ Roma La Sapienza, ISC CNR, I-00185 Rome, Italy

[5] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[6] Chinese Acad Sci, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China

[7] Univ Paris 06, CNRS, UMR 7600, Lab Phys Theor Mat Condensee, F-75255 Paris, France

[8] ENS, Phys Theor Lab, F-75005 Paris, France

[9] Inst Phys Theor Philippe Meyer, F-75005 Paris, France

[10] ISC CNR, I-00185 Rome, Italy

来源：

PHYSICAL REVIEW E | 2014年 / 89卷 / 04期

关键词：

THERMAL-EQUILIBRIUM; ADIABATIC PISTON; MOTION;

D O I：

10.1103/PhysRevE.89.042105

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

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, by 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 that 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 time scale, related to the interaction between the partitioning wall and the particles, which grows macroscopically.

引用

页数：9

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