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arXiv 2009.06015cond-mat.stat-mech
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监测Lévy过程交叉

Monitoring Lévy-Process Crossovers

Maike A. F. dos Santos, Fernando D. Nobre, Evaldo M. F. Curado

摘要:

两种或两种以上扩散过程的交叉是非平衡统计物理中一个活跃的主题。在这项工作中,我们提出了两个模型,以产生不同的Lévy过程之间的交叉:在第一个模型中,我们逐渐改变的阶导数的拉普拉斯项的扩散方程,而在第二个,我们考虑的分数阶导数扩散项的组合,其特征在于随时间变化的系数。这些建议是通过考虑半分析(即,分析与数值)程序,以遵循时间相关的解决方案。我们发现两个不同的制度之间的变化,它表明,远离交叉制度,这两个模型产生定性相似的结果,虽然这些变化可能会发生在不同的形式为两个模型。本文介绍的模型预计是有用的描述交叉之间的不同的扩散制度,经常发生在复杂系统。

英文摘要:

The crossover among two or more types of diffusive processes represents a vibrant theme in nonequilibrium statistical physics. In this work we propose two models to generate crossovers among different Lévy processes: in the first model we change gradually the order of the derivative in the Laplacian term of the diffusion equation, whereas in the second one we consider a combination of fractional-derivative diffusive terms characterized by coefficients that change in time. The proposals are illustrated by considering semi-analytical (i.e., analytical together with numerical) procedures to follow the time-dependent solutions. We find changes between two different regimes and it is shown that, far from the crossover regime, both models yield qualitatively similar results, although these changes may occur in different forms for the two models. The models introduced herein are expected to be useful for describing crossovers among distinct diffusive regimes that occur frequently in complex systems.

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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