Stretched exponential dynamics in a chain of coupled chaotic oscillators

Details Stretched exponential dynamics in a chain of coupled chaotic oscillators Stretched exponential dynamics in a chain of coupled chaotic oscillators

2002-04-08

arxiv.org/abs/cond-mat/0204179v1

Physics

Condensed Matter

9 pages, 6 figures

Scientific paper

10.1209/epl/i2002-00291-y

We measure stretched exponential behavior, exp(- (t/t_0)**beta), over many decades in a one-dimensional array of coupled chaotic electronic elements just above a crisis-induced intermittency transition. There is strong spatial heterogeneity and individual sites display a dynamics ranging from near power law ($\beta=0$) to near exponential ($\beta=1$) while the global dynamics, given by a spatial average, remains stretched exponential. These results can be reproduced quantitatively with a one-dimensional coupled-map lattice and thus appear to be system independent. In this model, local stretched exponential dynamics is achieved without frozen disorder and is a fundamental property of the coupled system. The heterogeneity of the experimental system can be reproduced by introducing quenched disorder in the model. This suggests that the stretched exponential dynamics can arise as a purely chaotic phenomenon.

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