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arXiv 1605.08930cond-mat.stat-mech
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全局记忆效应诱导的弱遍历破缺

Weak ergodicity breaking induced by global memory effects

Adrian A. Budini

摘要:

研究了一类定义在有限状态集上的全局关联随机游动动力学的弱遍历破缺现象。在一个给定状态的持久性或过渡到另一个依赖于整个系统先前的时间历史。与每个状态相关联的一组等待时间分布设置了连续步骤之间的随机时间。它们的平均值对所有状态都是有限的。对于不同的记忆机制,得到了时间平均观测量的概率密度。这个统计对象明确地显示了时间和总体平均值之间的偏差。虽然在每个状态的平均停留时间可能会导致发散,我们证明,这个条件是在一般情况下没有必要打破遍历性。因此,全局记忆效应是能够诱导这种性质的另一种机制。分析和数值计算支持这些结果。

英文摘要:

We study the phenomenon of weak ergodicity breaking for a class of globally correlated random walk dynamics defined over a finite set of states. The persistence in a given state or the transition to another one depends on the whole previous temporal history of the system. A set of waiting time distributions, associated to each state, set the random times between consecutive steps. Their mean value is finite for all states. The probability density of time-averaged observables is obtained for different memory mechanisms. This statistical object explicitly shows departures between time and ensemble averages. While the mean residence time in each state may result divergent, we demonstrate that this condition is in general not necessary for breaking ergodicity. Hence, global memory effects are an alternative mechanism able to induce this property. Analytical and numerical calculations support these results.

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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