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由关联噪声驱动的粒子反常扩散。

Anomalous diffusion of particles driven by correlated noise.

作者信息

Denisov SI, Horsthemke W

机构信息

Department of Mechanics and Mathematics, Sumy State University, 2, Rimskiy-Korsakov Street, 40007 Sumy, Ukraine.

出版信息

Phys Rev E Stat Phys Plasmas Fluids Relat Interdiscip Topics. 2000 Dec;62(6 Pt A):7729-34. doi: 10.1103/physreve.62.7729.

Abstract

We study the effect of an arbitrary stationary random force on the motion of damped particles. Using a Langevin description, we derive exact expressions for the dispersion of the particle position, of the particle velocity, and their cross dispersion. The particles can exhibit anomalous diffusion, and the connection between this behavior and the functional form of the noise correlations is investigated in detail. We also study anomalous diffusion for the special cases of overdamped and undamped particles.

摘要

我们研究任意平稳随机力对阻尼粒子运动的影响。利用朗之万描述,我们推导出了粒子位置、粒子速度的色散以及它们的交叉色散的精确表达式。粒子可能表现出反常扩散,并详细研究了这种行为与噪声关联函数形式之间的联系。我们还研究了过阻尼和无阻尼粒子的特殊情况下的反常扩散。

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