Sandpile Model on Sierpinski Gasket Fractal

Details Sandpile Model on Sierpinski Gasket Fractal Sandpile Model on Sierpinski Gasket Fractal

1995-04-06

arxiv.org/abs/cond-mat/9504022v2

Physics

Condensed Matter

Revised version. Some numerical values have been changed and additional results have been added. To appear in Physical Review

Scientific paper

We investigate the sandpile model on the two--dimensional Sierpinski gasket fractal. We find that the model displays novel critical behavior, and we analyze the distribution functions of avalanche sizes, lifetimes and topplings and calculate the associated critical exponents $\tau = 1.51 \pm 0.04$, $\alpha = 1.63 \pm 0.04$ and $\mu = 1.36 \pm 0.04$. The avalanche size distribution shows power law behavior modulated by logarithmic oscillations which can be related to the discrete scale invariance of the underlying lattice. Such a distribution can be formally described by introducing a complex scaling exponent ${\tau}^{*} \equiv \tau + i \delta$, where the real part $\tau$ corresponds to the power law and the imaginary part $\delta$ is related to the period of the logarithmic oscillations.

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