Mesoscopic fluctuations and intermittency in aging dynamics

Details Mesoscopic fluctuations and intermittency in aging dynamics Mesoscopic fluctuations and intermittency in aging dynamics

2005-06-07

arxiv.org/abs/cond-mat/0506173v2

Europhys. Lett., 73 (1), pp. 69-75 (2006)

Physics

Condensed Matter

Soft Condensed Matter

7 pages 5 figs, several corrections, final version to appear in EuroPhysics Letters

Scientific paper

10.1209/epl/i2005-10352-3

The configurational de-correlation in an aging system is attributed to irreversible intermittent rearrangements, which are described as a Poisson process with average $\propto \ln(1 + t/t_w)$, where $t$ is the observation time and $t_w$ is the age [P. Sibani and H.J. Jensen, Europhys. Lett. 69, 2005]. On this basis, we obtain a simple model for the off-equilibrium aging behavior of the autocorrelation: the average autocorrelation decays algebraically, and its shifted and rescaled probability density function (PDF) has a Gumbel-like shape which approaches a Gaussian at large times and becomes sharp in the thermodynamic limit. The model properties are tested against simulations of the Edwards-Anderson spin glass, and are in reasonable agreement with other available data.

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