Generalized Einstein Relation in an aging colloidal glass

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We present an experimental and theoretical investigation of the Generalized Einstein Relation (GER), a particular form of a fluctuation-dissipation relation, in an out-of-equilibrium visco-elastic fluid. Micrometer beads, used as thermometers, are immersed in an aging colloidal glass to provide both fluctuation and dissipation measurements. The deviations from the Generalized Einstein Relation are derived as a function of frequency and aging time. The observed deviations from GER are interpreted as directly related to the change in the glass relaxation times with aging time. In our scenario, deviations are observed in the regime where the observation time scale is of the order of a characteristic relaxation time of the glass.
20 pages, 6 figures; revised version

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Soft Condensed Matter

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http://salesiana.dossiersoluciones.com/handle/123456789/130306

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0605111
 http://arxiv.org/abs/cond-mat/0605111

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arXiv