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arXiv 1902.06963cond-mat.stat-mech
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布朗轨线运行域的协方差

Covariance of the running range of a Brownian trajectory

Brandon Annesi, Enzo Marinari, Gleb Oshanin

摘要:

在过去的几年里,关于布朗运动、布朗桥和Slepian过程的运行最大值的例子,讨论了在不同时间间隔上实现的随机过程的极值如何相互关联的问题。在这里,我们专注于布朗运动的运行范围的两个时间相关性-布朗轨迹在有限时间间隔上的最大程度。我们精确地计算了运行范围的协方差函数,并分析了它的渐近行为。我们的分析揭示了一些时间间隔上BM从顶部到底部的最大下降(上升)的值之间的非平凡的相关性,以及该属性在更大的时间间隔上的值。

英文摘要:

The question how the extremal values of a stochastic process achieved on different time intervals are correlated to each other has been discussed within the last few years on examples of the running maximum of a Brownian motion, of a Brownian Bridge and of a Slepian process. Here, we focus on the two-time correlations of the running range of Brownian motion - the maximal extent of a Brownian trajectory on a finite time interval. We calculate exactly the covariance function of the running range and analyse its asymptotic behaviour. Our analysis reveals non-trivial correlations between the value of the largest descent (rise) of a BM from the top to a bottom on some time interval, and the value of this property on a larger time interval.

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