Non-Gaussian behavior of reflected fractional Brownian motion
Non-Gaussian behavior of reflected fractional Brownian motion
复制标题
反射分数布朗运动的非高斯行为
DOI:
10.1088/1742-5468/ab02f1
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
Vojta, Thomas
中科院分区:
文献类型:
--
作者:
Wada, Alexander H;Warhover, Alex;Vojta, Thomas
A possible mechanism leading to anomalous diffusion is the presence of long-range correlations in time between the displacements of the particles. Fractional Brownian motion, a non-Markovian self-similar Gaussian process with stationary increments, is a prototypical model for this situation. Here, we extend the previous results found for unbiased reflected fractional Brownian motion (Wada et al 2018 Phys. Rev. E 97 020102) to the biased case by means of Monte Carlo simulations and scaling arguments. We demonstrate that the interplay between the reflecting wall and the correlations leads to highly non-Gaussian probability densities of the particle position x close to the reflecting wall. Specifically, the probability density develops a power-law singularity with if the correlations are positive (persistent) and if the correlations are negative (antipersistent). We also analyze the behavior of the large-x tail of the stationary probability density reached for bias towards the wall, the average displacements of the walker, and the first-passage time, ie the time it takes for the walker reach position x for the first time.
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DOI:
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发表时间:
2009
期刊:
影响因子:
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