Volume 82, Number 3, May 2008
Article Number 30007
Number of page(s) 6
Section General
Published online 17 April 2008
EPL, 82 (2008) 30007
DOI: 10.1209/0295-5075/82/30007

Fluctuations of the total entropy production in stochastic systems

S. Joubaud, N. B. Garnier and S. Ciliberto

Université de Lyon, Laboratoire de Physique de l'ENS Lyon, CNRS UMR 5672 - 46, Allée d'Italie, 69364 Lyon, Cedex 07, France, EU

received 15 November 2007; accepted in final form 7 March 2008; published May 2008
published online 17 April 2008

Fluctuations of the total entropy are experimentally investigated in two stochastic systems in a non-equilibrium steady state: an electric circuit with an imposed mean current and a harmonic oscillator driven out of equilibrium by a periodic torque. In these two linear systems, we study the total entropy production which is the entropy created to maintain the system in the non-equilibrium steady state. The fluctuation theorem holds for the total entropy production in the two experimental systems, both for all observation times and for all fluctuation magnitudes.

05.40.-a - Fluctuation phenomena, random processes, noise, and Brownian motion.
05.70.-a - Thermodynamics.

© EPLA 2008