title: Heat fluctuations in a nonequilibrium bath.
abstract: We measure the energy fluctuations of a Brownian particle confined by an optical trap in an aging gelatin after a very fast quench (less than 1 ms). The strong nonequilibrium fluctuations due to the assemblage of the gel are interpreted, within the framework of fluctuation theorem, as a heat flux from the particle towards the bath. We derive an analytical expression of the heat probability distribution, which fits the experimental data and satisfies a fluctuation relation similar to that of a system in contact with two baths at different temperatures.
authors.affiliation: Laboratoire de Physique, École Normale Supérieure de Lyon, CNRS UMR 5672, 46, Allée d'Italie, 69364 Lyon CEDEX 07, France. juan.gomez_solano@ens-lyon.fr
authors.forename: J R
authors.initials: JR
authors.lastname: Gomez-Solano
authors.forename: A
authors.initials: A
authors.lastname: Petrosyan
authors.forename: S
authors.initials: S
authors.lastname: Ciliberto