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arXiv 0912.3206cond-mat.stat-mech
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将沙堆推至临界状态及更高

Driving sandpiles to criticality and beyond

Anne Fey, Lionel Levine, David B. Wilson

摘要:

一个流行的自组织临界性理论将驱动耗散系统与守恒系统联系起来。该理论预言阿贝尔沙堆模型的稳态密度等于固定能量沙堆的阈值密度。我们反驳了这一预测的各种各样的基础图形,包括正方形网格。驱动耗散沙堆即使在达到临界状态后也会继续演化。这一结果对用固定能量沙堆来研究阿贝尔沙堆模型在平稳性下的临界行为的有效性提出了质疑。

英文摘要:

A popular theory of self-organized criticality relates driven dissipative systems to systems with conservation. This theory predicts that the stationary density of the abelian sandpile model equals the threshold density of the fixed-energy sandpile. We refute this prediction for a wide variety of underlying graphs, including the square grid. Driven dissipative sandpiles continue to evolve even after reaching criticality. This result casts 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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