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arXiv 1102.5639cond-mat.stat-mech
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耗散沙堆中多粒子关联的标度

Scaling of many-particle correlations in a dissipative sandpile

N. M. Bogoliubov, A. G. Pronko, J. Timonen

摘要:

将二维有向耗散沙堆问题转化为空间离散、时间连续的(1+1)维问题。主方程的条件概率K颗粒保持其初始顺序在雪崩过程中,从而可以精确地解决,并给出了一个明确的表达的解决方案的渐近形式的无限以及半无限晶格在水平方向上。在这两种情况下都发现了非平凡的缩放。这个条件概率的沙堆模型被证明是等于一个K-自旋关联函数的海森堡XX自旋链,和沙堆问题也被证明是相当于“随机转弯”版本的恶性步行者。

英文摘要:

The two dimensional directed sandpile with dissipation is transformed into a (1+1) dimensional problem with discrete space and continuous `time'. The master equation for the conditional probability that K grains preserve their initial order during an avalanche can thereby be solved exactly, and an explicit expression is given for the asymptotic form of the solution for an infinite as well as for a semi-infinite lattice in the horizontal direction. Non-trivial scaling is found in both cases. This conditional probability of the sandpile model is shown to be equal to a K-spin correlation function of the Heisenberg XX spin chain, and the sandpile problem is also shown to be equivalent to the `random-turns' version of vicious walkers.

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