Fluctuations of the total entropy production in stochastic systemsS. 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.
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