[Étude expérimentale des fluctuations du travail dans un oscillateur harmonique]
Nous étudions expérimentalement les fluctuations du travail d'une force externe sur un oscillateur harmonique en contact avec un bain thermique. Nous trouvons que les théorèmes de fluctuations pour les états transitoires et stationnaires sont vérifiés. Toutefois les corrections de temps fini pour l'état stationnaire sont très différentes de celles calculées dans le cadre de l'équation de Langevin du premier ordre. Nous étudions aussi le forçage périodique de l'oscillateur. Enfin nous discutons l'importance du choix du « bon travail » pour calculer l'énergie libre en partant de l'égalité de Jarzynski.
The work fluctuations of a harmonic oscillator in contact with a thermostat and driven out of equilibrium by an external force are studied experimentally. For the work both the transient and stationary state fluctuation theorems hold. The finite time corrections are very different from those of a first order Langevin equation. The heat and work fluctuations are studied when a periodic forcing is applied to the oscillator. The importance of the choice of the ‘good work’ to compute the free energy from the Jarzynski equality is discussed.
Publié le :
Mots-clés : Théorèmes de fluctuation, Travail, Hors-équilibre
Sylvain Joubaud 1 ; Nicolas B. Garnier 1 ; Frédéric Douarche 1 ; Artyom Petrosyan 1 ; Sergio Ciliberto 1
@article{CRPHYS_2007__8_5-6_518_0,
author = {Sylvain Joubaud and Nicolas B. Garnier and Fr\'ed\'eric Douarche and Artyom Petrosyan and Sergio Ciliberto},
title = {Experimental study of work fluctuations in a harmonic oscillator},
journal = {Comptes Rendus. Physique},
pages = {518--527},
publisher = {Elsevier},
volume = {8},
number = {5-6},
year = {2007},
doi = {10.1016/j.crhy.2007.04.012},
language = {en},
}
TY - JOUR AU - Sylvain Joubaud AU - Nicolas B. Garnier AU - Frédéric Douarche AU - Artyom Petrosyan AU - Sergio Ciliberto TI - Experimental study of work fluctuations in a harmonic oscillator JO - Comptes Rendus. Physique PY - 2007 SP - 518 EP - 527 VL - 8 IS - 5-6 PB - Elsevier DO - 10.1016/j.crhy.2007.04.012 LA - en ID - CRPHYS_2007__8_5-6_518_0 ER -
%0 Journal Article %A Sylvain Joubaud %A Nicolas B. Garnier %A Frédéric Douarche %A Artyom Petrosyan %A Sergio Ciliberto %T Experimental study of work fluctuations in a harmonic oscillator %J Comptes Rendus. Physique %D 2007 %P 518-527 %V 8 %N 5-6 %I Elsevier %R 10.1016/j.crhy.2007.04.012 %G en %F CRPHYS_2007__8_5-6_518_0
Sylvain Joubaud; Nicolas B. Garnier; Frédéric Douarche; Artyom Petrosyan; Sergio Ciliberto. Experimental study of work fluctuations in a harmonic oscillator. Comptes Rendus. Physique, Work, dissipation, and fluctuations in nonequilibrium physics, Volume 8 (2007) no. 5-6, pp. 518-527. doi : 10.1016/j.crhy.2007.04.012. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2007.04.012/
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