Eigenfunction approach to the persistent random walk in two dimensions

Eigenfunction approach to the persistent random walk in two dimensions
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二维持续随机游走的特征函数方法

DOI:
10.1016/j.physa.2003.07.003
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发表时间:
2003
影响因子:
3.3
通讯作者:
Christian Bracher
Christian Bracher
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Christian Bracher

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圆盘上函数的傅里叶-贝塞尔展开式产生平面持续随机游动中遇到的端到端概率分布函数w(R,φ)的简单级数表示,其中一步中采取的方向取决于与前一步的相对取向。对于除最短路径外的所有路径,所提出的方法提供了一种快速收敛、数值稳定的算法,对于尚未接近扩散极限的中等大小链的精确研究特别有用。a
The Fourier–Bessel expansion of a function on a circular disc yields a simple series representation for the end-to-end probability distribution function w(R,φ) encountered in a planar persistent random walk, where the direction taken in a step depends on the relative orientation towards the preceding step. For all but the shortest walks, the proposed method provides a rapidly converging, numerically stable algorithm that is particularly useful for the precise study of intermediate-size chains that have not yet approached the diffusion limit.a