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arXiv 2210.01658math.PR
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Ornstein-Uhlenbeck过程的越界问题与函数变换

Boundary crossing problems and functional transformations for Ornstein-Uhlenbeck processes

Aria Ahari, Larbi Alili, Massimiliano Tamborrino

AI总结:

研究Ornstein-Uhlenbeck过程到达时变阈值的首达时间分布,证明其与时变边界双参数函数变换族首达时间的关联,提供三种证明并探讨变换的代数与分析性质及镜像法应用。

摘要:

我们关注Ornstein-Uhlenbeck过程到达时变阈值的首达时间分布。我们证明该问题与过程到达时变边界的双参数函数变换族成员的首达时间分布相关。对于特定的参数值,这些变换出现在标准Ornstein-Uhlenbeck桥的一种实现中。我们提供了此关联的三种不同证明。第一种基于Brownian motion的类似结果,第二种使用所谓Gauss-Markov过程的推广,第三种依赖于Lie群对称方法。我们研究了这些变换的性质,并研究了用于构造它们的对合算子的代数和分析性质。我们还表明,这些变换将Sturm-Liouville方程的解空间映射为相关非线性常微分方程的解空间。最后,我们通过镜像法解释了结果,并给出了具有显式首达时间密度的曲线的新示例。

英文摘要:

We are interested in the law of the first passage time of an Ornstein-Uhlenbeck process to time-varying thresholds. We show that this problem is connected to the laws of the first passage time of the process to members of a two-parameter family of functional transformations of a time-varying boundary. For specific values of the parameters, these transformations appear in a realisation of a standard Ornstein-Uhlenbeck bridge. We provide three different proofs of this connection. The first one is based on a similar result for Brownian motion, the second uses a generalisation of the so-called Gauss-Markov processes and the third relies on the Lie group symmetry method. We investigate the properties of these transformations and study the algebraic and analytical properties of an involution operator which is used in constructing them. We also show that these transformations map the space of solutions of Sturm-Liouville equations into the space of solutions of the associated nonlinear ordinary differential equations. Lastly, we interpret our results through the method of images and give new examples of curves with explicit first passage time densities.

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