Are Avalanches in Sandpiles a Chaotic Phenomenon?

Details Are Avalanches in Sandpiles a Chaotic Phenomenon? Are Avalanches in Sandpiles a Chaotic Phenomenon?

2004-02-13

arxiv.org/abs/cond-mat/0402365v1

Physics

Condensed Matter

Statistical Mechanics

6 pages, 3 figures

Scientific paper

10.1016/j.physa.2004.05.006

We show that deterministic systems with strong nonlinearities seem to be more appropriate to model sandpiles than stochastic systems or deterministic systems in which discontinuities are the only nonlinearity. In particular, we are able to reproduce the breakdown of Self-Organized Criticality found in two well known experiments, that is, a centrally fueled pile [Held et al. Phys. Rev. Lett. 65 (1990) 1120] and sand in a rotating tray [Bretz et al. Phys. Rev. Lett. 69 (1992) 2431]. By varying the parameters of the model we recover Self-Organized Criticality, in agreement with other experiments and other models. We show that chaos plays a fundamental role in the dynamics of the system.

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