title: Entropy production and time asymmetry in nonequilibrium fluctuations.
abstract: The time-reversal symmetry of nonequilibrium fluctuations is experimentally investigated in two out-of-equilibrium systems: namely, a Brownian particle in a trap moving at constant speed and an electric circuit with an imposed mean current. The dynamical randomness of their nonequilibrium fluctuations is characterized in terms of the standard and time-reversed entropies per unit time of dynamical systems theory. We present experimental results showing that their difference equals the thermodynamic entropy production in units of Boltzmann's constant.
authors.affiliation: Center for Nonlinear Phenomena and Complex Systems, Université Libre de Bruxelles, Code Postal 231, Campus Plaine, B-1050 Brussels, Belgium.
authors.forename: D
authors.initials: D
authors.lastname: Andrieux
authors.forename: P
authors.initials: P
authors.lastname: Gaspard
authors.forename: S
authors.initials: S
authors.lastname: Ciliberto
authors.forename: N
authors.initials: N
authors.lastname: Garnier
authors.forename: S
authors.initials: S
authors.lastname: Joubaud
authors.forename: A
authors.initials: A
authors.lastname: Petrosyan