Fluctuations, linear response and heat flux of an aging system
Laboratoire de Physique, Ecole Normale Supérieure de Lyon, CNRS UMR 5672 - 46, Allée d'Italie, 69364 Lyon CEDEX 07, France, EU
Accepted: 2 March 2012
We measure the fluctuations of the position of a Brownian particle confined by an optical trap in an aging gelatin droplet after a fast quench. Its linear response to an external perturbation is also measured. We compute the spontaneous heat flux from the particle to the bath due to the non-equilibrium formation of the gel. We show that the mean heat flux is quantitatively related to the violation of the equilibrium fluctuation-dissipation theorem as a measure of the broken detailed balance during the aging process.
PACS: 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion
© EPLA, 2012