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arXiv 0811.4738cond-mat.stat-mech
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亚扩散输运中的普适涨落

Universal fluctuations in subdiffusive transport

I. M. Sokolov, E. Heinsalu, P. Hanggi, I. Goychuk

摘要:

利用分数阶Fokker-Planck方程方法,在连续时间随机游走(CTRW)框架下研究了倾斜搓板势中的亚扩散输运。缩放的亚速度服从一个普遍的规律,假设一个固定的列维稳定分布的形式。后者仅由次扩散指数α和平均次速度定义,但有趣的是既不依赖于偏置强度,也不依赖于势的具体形式。这些标度的,普遍的亚速度波动出现由于弱遍历性破缺和消失的正常扩散的极限。的分析启发式理论的结果证实了底层的CTRW的蒙特卡罗模拟。

英文摘要:

Subdiffusive transport in tilted washboard potentials is studied within the fractional Fokker-Planck equation approach, using the associated continuous time random walk (CTRW) framework. The scaled subvelocity is shown to obey a universal law, assuming the form of a stationary Levy-stable distribution. The latter is defined by the index of subdiffusion alpha and the mean subvelocity only, but interestingly depends neither on the bias strength nor on the specific form of the potential. These scaled, universal subvelocity fluctuations emerge due to the weak ergodicity breaking and are vanishing in the limit of normal diffusion. The results of the analytical heuristic theory are corroborated by Monte Carlo simulations of the underlying CTRW.

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