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arXiv 1202.0683cond-mat.stat-mechnlin.CD
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Levy带速度波动的行走

Levy walks with velocity fluctuations

S. Denisov, V. Zaburdaev, P. Hanggi

摘要:

标准的列维行走是由一个粒子在随机发生的碰撞之间进行弹道运动,碰撞时间是一个由幂律分布控制的随机变量。在瞬时碰撞事件中,粒子随机改变运动方向,但保持相同的恒定速度。我们推广的标准模型,将速度波动的过程。两种类型的模型被认为是,即(i)与步行者改变的方向和绝对值的速度在碰撞过程中,(ii)与步行者的速度不断波动。我们提出了充分的分析评估这两种模式,并强调初始条件的重要性。我们表明,潜在的利维行走过程的类型可以通过查看弹道区域的扩散配置文件。我们的分析结果证实了数值模拟。

英文摘要:

The standard Levy walk is performed by a particle that moves ballistically between randomly occurring collisions, when the intercollision time is a random variable governed by a power-law distribution. During instantaneous collision events the particle randomly changes the direction of motion but maintains the same constant speed. We generalize the standard model to incorporate velocity fluctuations into the process. Two types of models are considered, namely, (i) with a walker changing the direction and absolute value of its velocity during collisions only, and (ii) with a walker whose velocity continuously fluctuates. We present full analytic evaluation of both models and emphasize the importance of initial conditions. We show that the type of the underlying Levy walk process can be identified by looking at the ballistic regions of the diffusion profiles. Our analytical results are corroborated by numerical simulations.

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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