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arXiv 1507.05074cond-mat.stat-mech
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反常扩散与各向异性渗流的随机Loewner演化

Stochastic Loewner Evolution Relates Anomalous Diffusion and Anisotropic Percolation

H. F. Credidio, A. A. Moreira, H. J. Herrmann, J. S. Andrade

摘要:

我们揭示了起源的各向异性渗流周长的随机Loewner演化(SLE)过程。准确地说,我们的结果从广泛的数值模拟表明,在临界状态下的多层和定向渗流集团的周长是Loewner演化的异常布朗运动的标度极限,分别是subdiffusive和superdiffusive。采用长程幂律相关时间序列(分数布朗运动)作为演化过程中的驱动函数,进一步检验了异常扩散与分形各向异性之间的联系。所得迹线明显各向异性的事实证实了我们的假设。因此,在SLE的概念框架下,我们的研究揭示了非马尔可夫过程在临界时的各向异性路径的数学和物理解释的新视角,反之亦然。

英文摘要:

We disclose the origin of anisotropic percolation perimeters in terms of the Stochastic Loewner Evolution (SLE) process. Precisely, our results from extensive numerical simulations indicate that the perimeters of multi-layered and directed percolation clusters at criticality are the scaling limits of the Loewner evolution of an anomalous Brownian motion, being subdiffusive and superdiffusive, respectively. The connection between anomalous diffusion and fractal anisotropy is further tested by using long-range power-law correlated time series (fractional Brownian motion) as driving functions in the evolution process. The fact that the resulting traces are distinctively anisotropic corroborates our hypothesis. Under the conceptual framework of SLE, our study therefore reveals new perspectives for mathematical and physical interpretations of non-Markovian processes in terms of anisotropic paths at criticality and vice-versa.

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