Self-reinforcing directionality generates truncated Lévy walks without the power-law assumption.

Self-reinforcing directionality generates truncated Lévy walks without the power-law assumption.
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自我强化的方向性会在没有幂律假设的情况下生成截断的 Lévy 游走。

DOI:
10.1103/physreve.103.022132
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发表时间:
2021
期刊:
Physical review. E
影响因子:
--
通讯作者:
Han D
Han D
中科院分区:
--
文献类型:
--
作者:
Han D

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我们引入了一个有限速度和自增强方向性的持久随机行走模型,该模型解释了Chenet等人在主动细胞内运输中观察到的截断Lévy行走是如何从指数分布的自组织运行到截断的Lévy行走的。推导了粒子位置概率密度函数的时空非齐次双曲型偏微分方程组。这个PDF在超扩散区呈现出双峰密度(聚集现象),这在经典的线性双曲和L漫步模型中是没有观察到的。我们找到了一阶矩和二阶矩的精确解以及向超扩散转变的判据。
We introduce a persistent random walk model with finite velocity and self-reinforcing directionality, which explains how exponentially distributed runs self-organize into truncated Lévy walks observed in active intracellular transport by Chenet al.[Nature Mater., 14, 589 (2015)10.1038/nmat4239]. We derive the nonhomogeneous in space and time, hyperbolic partial differential equation for the probability density function (PDF) of particle position. This PDF exhibits a bimodal density (aggregation phenomena) in the superdiffusive regime, which is not observed in classical linear hyperbolic and Lévy walk models. We find the exact solutions for the first and second moments and criteria for the transition to superdiffusion.
神经元中的溶酶体和内体组织和运输
DOI: --
发表时间: 2009
期刊:
影响因子: --
作者:
J. G. Gindhart;K. Weber
通讯作者: K. Weber