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arXiv 2107.05095math.PR
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Laplace随机游动的极值顺序统计量中的隐对称性和极限律

Hidden symmetries and limit laws in the extreme order statistics of the Laplace random walk

Jim Pitman, Wenpin Tang

摘要:

本文研究由对称Laplace行走导出的极值顺序统计量的极限律。本文给出了极限极值顺序统计量点过程的两种不同描述:分支表示和平方贝塞尔表示。这些互补的描述揭示了分支过程和布朗运动中各种隐藏的对称性,这些对称性隐藏在Schehr和Majumdar(Phys. Rev. Lett.,108:040601)。特别地,维数为$4 = 2+2$的Bessel过程在描述中表现为布朗运动在局部极小值的路径分解和布朗局部时在极小值附近的Ray-Knight描述.

英文摘要:

This paper is concerned with the limit laws of the extreme order statistics derived from a symmetric Laplace walk. We provide two different descriptions of the point process of the limiting extreme order statistics: a branching representation and a squared Bessel representation. These complementary descriptions expose various hidden symmetries in branching processes and Brownian motion which lie behind some striking formulas found by Schehr and Majumdar (Phys. Rev. Lett., 108:040601). In particular, the Bessel process of dimension $4 = 2+2$ appears in the descriptions as a path decomposition of Brownian motion at a local minimum and the Ray-Knight description of Brownian local times near the minimum.

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