Nonequilibrium steady state fluctuations in actively cooled resonators
Statistical Mechanics
2009-07-17 v1 General Relativity and Quantum Cosmology
Abstract
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.
Cite
@article{arxiv.0906.2705,
title = {Nonequilibrium steady state fluctuations in actively cooled resonators},
author = {M. Bonaldi and L. Conti and P. De Gregorio and L. Rondoni and G. Vedovato and A. Vinante and M. Bignotto and M. Cerdonio and P. Falferi and N. Liguori and S. Longo and R. Mezzena and A. Ortolan and G. A. Prodi and F. Salemi and L. Taffarello and S. Vitale and J. -P. Zendri},
journal= {arXiv preprint arXiv:0906.2705},
year = {2009}
}
Comments
to be published in Phys. Rev. Lett