Berlin 2012 – scientific programme
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DY: Fachverband Dynamik und Statistische Physik
DY 22: Posters I
DY 22.40: Poster
Wednesday, March 28, 2012, 17:00–19:00, Poster A
Fluctuations, linear response and heat flux of an aging system — Juan Ruben Gomez-Solano1,2, •Artyom Petrosyan1, and Sergio Ciliberto1 — 1Laboratoire de Physique (UMR CNRS 5672), ENS de Lyon, 46, allée d'Italie, F-69364 Lyon CEDEX 07, France. — 2Current address: Universität Stuttgart, 2. Physikalisches Institut Pfaffenwaldring 57, 70569 Stuttgart, Germany.
We experimentally measure the fluctuations of the position of a colloidal particle confined bz an optical trap in an aging gelatin after a fast quench and its linear response to an external perturbation. We compute the spontaneous heat flux from the particle to the bath due to the nonequilibrium assemblage of the gel. We show that: 1) the heat fluctuations satisfy the fluctuation theorem and 2) the mean heat flux is quantitatively related to the violation of the fluctuation-dissipation theorem as a measure of the broken detail balance during the aging process.