Glassy dynamics: effective temperatures and intermittencies from a two-state model |
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| Institution: | 1. Department of Mechanical and Aerospace Engineering, New Mexico State University, Las Cruces, NM 88001, USA;2. Center for Design, Manufacturing, and Materials, Skolkovo Institute of Science and Technology, Skolkovo, Russia;3. Departamento de Mecanica de los Medios Continuos y T. Estructuras, Universidad Politecnica de Madrid, Madrid, 28040, Spain;4. School of Mathematics & Statistics, University of Glasgow, Glasgow G12 8SQ, UK;5. Facultad de Matematica y Computacion, Universidad de La Habana, La Habana, CP 10400, Cuba |
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| Abstract: | 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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