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arXiv 1605.06930math.PR
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关于停时的平面布朗格林函数

On the planar Brownian Green's function for stopping times

Greg Markowsky

摘要:

一段时间以来,人们已经知道平面区域的格林函数可以用布朗运动的退出时间来定义,并且这个定义已经扩展到比退出时间更一般的停时。本文将格林函数共形不变性的概念推广到非内射的解析函数,并利用这一推广计算了由布朗运动的缠绕定义的停时的格林函数.这些考虑导致黎曼映射定理的一个新的证明。我们还展示了如何这种不变性可以用来推导出几个身份,包括标准的无穷乘积表示的几个三角函数。

英文摘要:

It has been known for some time that the Green's function of a planar domain can be defined in terms of the exit time of Brownian motion, and this definition has been extended to stopping times more general than exit times. In this paper, we extend the notion of conformal invariance of Green's function to analytic functions which are not injective, and use this extension to calculate the Green's function for a stopping time defined by the winding of Brownian motion. These considerations lead to a new proof of the Riemann mapping theorem. We also show how this invariance can be used to deduce several identities, including the standard infinite product representations of several trigonometric functions.

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