Precise toppling balance, quenched disorder, and universality for sandpiles

Abstract

A single sandpile model with quenched random toppling matrices captures the crucial features of different models of self-organized criticality. With symmetric matrices avalanche statistics falls in the multiscaling BTW universality class. In the asymmetric case the simple scaling of the Manna model is observed. The presence or absence of a precise toppling balance between the amount of sand released by a toppling site and the total quantity the same site receives when all its neighbors topple once determines the appropriate universality class.

5 Revtex pages, 4 figures

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• Patterned and Disordered Continuous Abelian Sandpile Model