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arXiv 1007.3217cond-mat.stat-mechnlin.CG
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促进不对称排除

Facilitated Asymmetric Exclusion

Alan Gabel, P. L. Krapivsky, S. Redner

摘要:

我们引入了一类易化的不对称排斥过程,其中粒子被邻居从后面推。对于最简单的版本,其中一个粒子可以跳到它的空的右邻居,只有当它的左邻居被占用,我们确定的稳态电流和环上的集群大小的分布。我们表明,初始密度下降发展成一个稀疏波,可以有一个跳跃的不连续性在前缘,而上升的结果在冲击波。这种意想不到的稀疏波不连续性通常发生在易化排斥过程中。

英文摘要:

We introduce a class of facilitated asymmetric exclusion processes in which particles are pushed by neighbors from behind. For the simplest version in which a particle can hop to its vacant right neighbor only if its left neighbor is occupied, we determine the steady state current and the distribution of cluster sizes on a ring. We show that an initial density downstep develops into a rarefaction wave that can have a jump discontinuity at the leading edge, while an upstep results in a shock wave. This unexpected rarefaction wave discontinuity occurs generally for facilitated exclusion processes.

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