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Summary: 614 Brazilian Journal of Physics, vol. 36, no. 3A, September, 2006
Heterogeneities in Aging Models of Granular Compaction
Jeferson J. Arenzon
Instituto de Física, Universidade Federal do Rio Grande do Sul
CP 15051, 91501-970 Porto Alegre RS, Brazil
Received on 4 August, 2005
Kinetically constrained models (KCM) are systems with trivial thermodynamics but often complex dynamical
behavior due to constraints on the accessible paths followed by the system. Exploring these properties, the Kob-
Andersen (KA) model was introduced to study the slow dynamics of glass forming liquids and later extended
to granular materials. In this last context, we present new results on the heterogeneous character of both in and
out of equilibrium dynamics, further stretching the granular-glass analogy.
Keywords: Granular material; Dynamical heterogeneities; Glass transition
I. INTRODUCTION
In recent years, the analogy between structural glasses and
dense granular systems has become deeper and extensively
explored [125]. As temperature is lowered, or density in-
creased, respectively, both systems undergo a glass, or jam-
ming, transition, where the relaxation times dramatically in-
crease. Yet, in spite of all evidence of phenomenological sim-
ilarity, the two systems are fundamentally different, for exam-
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