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DY: Fachverband Dynamik und Statistische Physik

DY 22: Posters I

DY 22.40: Poster

Mittwoch, 28. März 2012, 17:00–19:00, Poster A

Fluctuations, linear response and heat flux of an aging system — Juan Ruben Gomez-Solano^1,2, •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.