Phys. Rev. Lett. 98, 150601 (2007) [4 pages]Entropy Production and Time Asymmetry in Nonequilibrium FluctuationsReceived 27 November 2006; published 10 April 2007 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. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.150601
DOI:
10.1103/PhysRevLett.98.150601
PACS:
05.70.Ln, 02.50.Ey, 05.40.−a
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