Issue |
EPL
Volume 98, Number 1, April 2012
|
|
---|---|---|
Article Number | 10007 | |
Number of page(s) | 6 | |
Section | General | |
DOI | https://doi.org/10.1209/0295-5075/98/10007 | |
Published online | 05 April 2012 |
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
a
sergio.ciliberto@ens-lyon.fr
Received:
20
December
2011
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
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