Nonequilibrium Steady-State Fluctuations in Actively Cooled Resonators

被引：54

作者：

Bonaldi, M. ^{[1
,2
]}

Conti, L. ^{[3
]}

De Gregorio, P. ^{[4
]}

Rondoni, L. ^{[4
]}

Vedovato, G. ^{[3
]}

Vinante, A. ^{[3
]}

Bignotto, M. ^{[3
,5
]}

Cerdonio, M. ^{[3
,5
]}

Falferi, P. ^{[1
,2
]}

Liguori, N. ^{[2
,6
]}

Longo, S. ^{[3
,5
]}

Mezzena, R. ^{[2
,6
]}

Ortolan, A. ^{[7
]}

Prodi, G. A. ^{[2
,6
]}

Salemi, F. ^{[2
,6
]}

Taffarello, L. ^{[3
]}

Vitale, S. ^{[2
,6
]}

Zendri, J. -P. ^{[3
]}

机构：

[1] CNR Fdn Bruno Kessler, Ist Foton & Nanotecnol, I-38100 Trento, Italy

[2] Ist Nazl Fis Nucl, Grp Coll Trento, Sez Padova, I-38100 Trento, Italy

[3] INFN, Sez Padova, I-35131 Padua, Italy

[4] Politecn Torino, Dip Matemat, I-10129 Turin, Italy

[5] Univ Padua, Dipartimento Fis, I-35131 Padua, Italy

[6] Univ Trent, Dipartimento Fis, I-38100 Trento, Italy

[7] INFN, Lab Nazl Legnaro, I-35020 Padua, Italy

来源：

PHYSICAL REVIEW LETTERS | 2009年 / 103卷 / 01期

基金：

欧洲研究理事会;

关键词：

STATISTICAL PHYSICS; THEOREM; DISSIPATION; SYSTEMS;

D O I：

10.1103/PhysRevLett.103.010601

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We analyze heat and work fluctuations in the gravitational wave detector AURIGA, modeled as a macroscopic electromechanical oscillator in contact with a thermostat and cooled by an active feedback system. The oscillator is driven to a steady state by the feedback cooling, equivalent to a viscous force. The experimentally measured fluctuations are in agreement with our theoretical analysis based on a stochastically driven Langevin system. The asymmetry of the fluctuations of the absorbed heat characterizes the oscillator's nonequilibrium steady state and reveals the extent to which a feedback cooled system departs from equilibrium in a statistical mechanics perspective.

引用

页数：4

共 26 条

[11] Fluidized granular medium as an instance of the fluctuation theorem [J].