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arXiv 1104.4041math.PRcond-mat.stat-mech
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分数扩散的从属路径

Subordination Pathways to Fractional Diffusion

Rudolf Gorenflo, Francesco Mainardi

摘要:

将一维幂律下的解耦连续时间随机游动(CTRW)分解为三种不同的随机游动:(rw_1),发生在操作时间内的自然时间线上的随机游动;(rw_2),发生在操作时间内的空间线上的随机游动;(rw_3)是(rw_1)的逆,即沿操作时间线的随机游动,发生在自然时间内。通过CTRW的一般积分方程和适当的重新标度,过渡到扩散极限进行这三个随机游动。结合(rw_1)和(rw_2)的极限,我们得到了生成粒子路径的参数从属方法,而结合(rw_2)和(rw_3),我们得到了时空分数扩散中逗留概率密度的从属积分。

英文摘要:

The uncoupled Continuous Time Random Walk (CTRW) in one space-dimension and under power law regime is splitted into three distinct random walks: (rw_1), a random walk along the line of natural time, happening in operational time; (rw_2), a random walk along the line of space, happening in operational time;(rw_3), the inversion of (rw_1), namely a random walk along the line of operational time, happening in natural time. Via the general integral equation of CTRW and appropriate rescaling, the transition to the diffusion limit is carried out for each of these three random walks. Combining the limits of (rw_1) and (rw_2) we get the method of parametric subordination for generating particle paths, whereas combination of (rw_2) and (rw_3) yields the subordination integral for the sojourn probability density in space-time fractional diffusion.

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