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arXiv 1509.03082cond-mat.stat-mechmath.PR
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Kardar-Parisi-Zhang波动的特征符号更新

Characteristic Sign Renewals of Kardar-Parisi-Zhang Fluctuations

Kazumasa A. Takeuchi, Takuma Akimoto

摘要:

跟踪由$(1+1)$维Kardar-Parisi-Zhang(KPZ)普适性类支配的波动的符号,我们表明,无论是实验还是数值模拟,它的演变与一个简单的随机模型有着意想不到的联系,称为更新过程,在老化和遍历性破坏的背景下研究。虽然KPZ和更新过程在许多方面有本质的不同,但我们发现在一些时间相关性质上,如递归时间分布和持续概率,这两个系统可以在其他性质上不同。此外,我们发现在一个特定的符号的KPZ类波动所占用的时间的一部分,长时间和合奏平均值之间的不等价性。其长期平均值的分布收敛到非平凡的广泛的功能,这被发现显着不同的更新过程,而是KPZ的特性。这样,我们得到了一类新的多体相互作用系统的遍历破缺。我们的分析还检测到定性差异的时间相关性的圆形和平坦的KPZ类接口,这是建议从以前的实验和模拟,但仍然在理论上无法解释。

英文摘要:

Tracking the sign of fluctuations governed by the $(1+1)$-dimensional Kardar-Parisi-Zhang (KPZ) universality class, we show, both experimentally and numerically, that its evolution has an unexpected link to a simple stochastic model called the renewal process, studied in the context of aging and ergodicity breaking. Although KPZ and the renewal process are fundamentally different in many aspects, we find remarkable agreement in some of the time correlation properties, such as the recurrence time distributions and the persistence probability, while the two systems can be different in other properties. Moreover, we find inequivalence between long-time and ensemble averages in the fraction of time occupied by a specific sign of the KPZ-class fluctuations. The distribution of its long-time average converges to nontrivial broad functions, which are found to differ significantly from that of the renewal process, but instead be characteristic of KPZ. Thus, we obtain a new type of ergodicity breaking for such systems with many-body interactions. Our analysis also detects qualitative differences in time-correlation properties of circular and flat KPZ-class interfaces, which were suggested from previous experiments and simulations but still remain theoretically unexplained.

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