On the Triviality of Aging (original) (raw)

Bulletin of the American Physical Society, 2010

Abstract

ABSTRACT The dynamics of complex systems collectively known as glassy share important phenomenological traits. Whether structural or quenched, either in low-T magnets or in dense colloids, physical changes occur in an intermittent fashion and, on average, at a decreasing rate. Despite their microscopic differences, generally, a transition is observed from a time-homogeneous regime to one which is likewise homogeneous, but in terms of the logarithm of time: A global change of the independent variable trivializes the dynamics. Focusing here on experimental data from dense colloidsfootnotetextCourtland & Weeks, J. Phys.: Condens. Matter 15, S359 (2003)., the crucial importance of record-size fluctuation for the aging dynamics is revealed. A model with a generic stochastic dynamics is introducedfootnotetextsee also: Boettcher & Sibani, http://arxiv.org/pdf/0910.5470\. which relies on the growth and collapse of strongly correlated clusters (``dynamic heterogeneities''). In the limit where large clusters dominate the dynamics, intermittency in terms of record-size events occurs with rate 1/t, implying a homogeneous, -Poissonian process that qualitatively reproduces the experimental results for colloidal dynamics.footnotetextSee also http://www.physics.emory.edu/faculty/boettcher/.

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