The approach to criticality in sandpiles

Details The approach to criticality in sandpiles The approach to criticality in sandpiles

2010-01-19

arxiv.org/abs/1001.3401v2

Phys. Rev. E 82, 031121 (2010)

Mathematics

Probability

30 pages, 8 figures, long version of arXiv:0912.3206

Scientific paper

10.1103/PhysRevE.82.031121

A popular theory of self-organized criticality relates the critical behavior of driven dissipative systems to that of systems with conservation. In particular, this theory predicts that the stationary density of the abelian sandpile model should be equal to the threshold density of the corresponding fixed-energy sandpile. This "density conjecture" has been proved for the underlying graph Z. We show (by simulation or by proof) that the density conjecture is false when the underlying graph is any of Z^2, the complete graph K_n, the Cayley tree, the ladder graph, the bracelet graph, or the flower graph. Driven dissipative sandpiles continue to evolve even after a constant fraction of the sand has been lost at the sink. These results cast doubt on the validity of using fixed-energy sandpiles to explore the critical behavior of the abelian sandpile model at stationarity.

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