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Glassy dynamics: effective temperatures and intermittencies from a two-state model

✍ Scribed by M. Naspreda; D. Reguera; A. Pérez-Madrid; J.M. Rubí

Publisher
Elsevier Science
Year
2005
Tongue
English
Weight
217 KB
Volume
351
Category
Article
ISSN
0378-4371

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✦ Synopsis

We show the existence of intermittent dynamics in one of the simplest model of a glassy system: the two-state model, which has been used [Physica A 329 (2003) 357] to explain the origin of the violation of the fluctuation-dissipation theorem. The dynamics is analyzed through a Langevin equation for the evolution of the state of the system through its energy landscape. The results obtained concerning the violation factor and the non-Gaussian nature of the fluctuations are in good qualitative agreement with experiments measuring the effective temperature and the voltage fluctuations in gels and in polymer glasses. The method proposed can be useful to study the dynamics of other slow relaxation systems in which non-Gaussian fluctuations have been observed.

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