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arXiv 1004.4413math.PRcond-mat.stat-mech
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Mittag-Leffler等待时间,幂律,稀疏性,连续时间随机游动,扩散极限

Mittag-Leffler Waiting Time, Power Laws,Rarefaction, Continuous Time Random Walk, Diffusion Limit

Rudolf Gorenflo

摘要:

本文讨论了Mittag-Leffler函数及其相关的概率分布在更新过程和连续时间随机游动理论中的一些应用。特别是,我们显示了一个通用的幂律等待时间的Mittag-Leffler等待时间分布的渐近(长时间)等效通过重新缩放和重新加速的时钟的时间。通过第二次重新加速(通过重新标度空间变量),我们得到了连续时间随机游动在时间和空间上的幂律制度下的扩散极限。最后,我们展示了时间分数漂移过程作为一个扩散极限的分数泊松过程和作为一个从属的时空分数扩散。

英文摘要:

We discuss some applications of the Mittag-Leffler function and related probability distributions in the theory of renewal processes and continuous time random walks. In particular we show the asymptotic (long time) equivalence of a generic power law waiting time to the Mittag-Leffler waiting time distribution via rescaling and respeeding the clock of time. By a second respeeding (by rescaling the spatial variable) we obtain the diffusion limit of the continuous time random walk under power law regimes in time and in space. Finally, we exhibit the time-fractional drift process as a diffusion limit of the fractional Poisson process and as a subordinator for space-time fractional diffusion.

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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