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arXiv 1004.4422math-phmath.MP
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分形曲线上的Fokker Planck方程

Fokker Planck Equation on Fractal Curves

Seema E. Satin, Abhay Parvate, A. D. Gangal

摘要:

从分形曲线上的Chapmann-Kolmogorov方程出发,得到分形曲线上的Fokker-Planck方程。这是使用最近开发的微积分分形,它允许一个写微分方程的分形曲线。作为一个重要的特例,求出了扩散系数和漂移系数,从而得到了分形曲线上的扩散方程。这个方程在时间上是一阶的,在空间变量上它涉及阶数为$α$的导数,$α$是曲线的维数。这个方程的局部化初始条件的解决方案显示偏离普通的扩散行为,由于底层的分形空间中的扩散正在发生。该方程的精确解表现出次扩散行为。分形路径的维数可由分布函数估计。

英文摘要:

A Fokker Planck equation on fractal curves is obtained, starting from Chapmann-Kolmogorov equation on fractal curves. This is done using the recently developed calculus on fractals, which allows one to write differential equations on fractal curves. As an important special case, the diffusion and drift coefficients are obtained, for suitable transition probability to get the diffusion equation on fractal curves. This equation is of first order in time, and, in space variable it involves derivatives of order $α$, $α$ being the dimension of the curve. The solution of this equation with localized initial condition shows deviation from ordinary diffusion behaviour due to underlying fractal space in which diffusion is taking place. An exact solution of this equation manifests a subdiffusive behaviour. The dimension of the fractal path can be estimated from the distrubution function.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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