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arXiv 1003.3182cond-mat.stat-mech
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一类老化过程的广义Khinchin定理

Generalized Khinchin Theorem for a Class of Aging Processes

S. Burov, R. Metzler, E. Barkai

摘要:

辛钦定理根据相应的关联函数的行为提供了平稳过程遍历的条件。许多物理系统受非平稳过程控制,其中关联函数表现出老化。我们对这类系统的遍历行为进行了分类,并给出了Khinchin定理的推广。我们的工作量化的偏离遍历老化关联函数。在分数阶Fokker-Planck方程的框架下,得到了一般束缚势中粒子位移的二次关联函数的简单解析表达式,揭示了束缚势仅通过相应Boltzmann分布的前两阶矩进入前因子的普遍性.我们讨论了应用程序的实验数据系统表现出异常动力学。

英文摘要:

The Khinchin theorem provides the condition that a stationary process is ergodic, in terms of the behavior of the corresponding correlation function. Many physical systems are governed by non-stationary processes in which correlation functions exhibit aging. We classify the ergodic behavior of such systems and provide a generalization of Khinchin's theorem. Our work quantifies deviations from ergodicity in terms of aging correlation functions. Using the framework of the fractional Fokker-Planck equation we obtain a simple analytical expression for the two-time correlation function of the particle displacement in a general binding potential, revealing universality in the sense that the binding potential only enters into the prefactor through the first two moments of the corresponding Boltzmann distribution. We discuss applications to experimental data from systems exhibiting anomalous dynamics.

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