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arXiv 1409.0949cond-mat.stat-mech
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反常扩散中基于标度律的时间平均

Time-Average Based on Scaling Law in Anomalous Diffusions

Hyun-Joo Kim

摘要:

为了解决反常扩散中出现的弱遍历性破缺给测量带来的困难,我们提出了积分间隔与滞后时间$τ$成线性关系的时间平均均方位移(MSD)$\bar{δ^2 (τ)}_τ$。对于描述亚扩散行为的连续时间随机游走,我们发现$\bar{δ^2 (τ)}_τ\sim τ^γ$与整体平均MSD相似,这使得在类似于单分子跟踪的实验中通过时间平均来测量适当的指数值成为可能。我们还发现,这是起源于MSD的标度性质在老化时间的异常扩散,并证实了他们通过数值计算结果的另一个微观非马尔可夫模型显示subdiffusion和superdiffusion与记忆增强的起源。

英文摘要:

To solve the obscureness in measurement brought about from the weak ergodicity breaking appeared in anomalous diffusions we have suggested the time-averaged mean squared displacement (MSD) $\bar{δ^2 (τ)}_τ$ with a integral interval depending linearly on the lag time $τ$. For the continuous time random walk describing a subdiffusive behavior, we have found that $\bar{δ^2 (τ)}_τ\sim τ^γ$ like that of the ensemble-averaged MSD, which makes it be possible to measure the proper exponent values through time-average in experiments like a single molecule tracking. Also we have found that it is originated from the scaling nature of the MSD at a aging time in anomalous diffusion and confirmed them through numerical results of the other microscopic non-Markovian model showing subdiffusions and superdiffusions with the origin of memory enhancement.

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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