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arXiv 1012.2038math.PR
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关于仿射边界的反射布朗运动和Bessel过程的首中时时

On hitting times of affine boundaries by reflecting Brownian motion and Bessel processes

Paavo Salminen, Marc Yor

摘要:

首先,我们通过反射布朗运动计算线性时变边界$t\mapsto a+bt,\ a\geq 0,\,b\in \R,$的首中时的分布函数。主要工具是Doob公式,它给出了在楔形内开始的布朗运动不击中该楔形的概率。其他关键成分是布朗运动的时间反演性质和扩散桥的时间反演性质。其次,该方法也可以应用于三维贝塞尔过程。第三,我们考虑从0到0的贝塞尔桥与尺寸参数$δ>0$,并表明,这样的贝塞尔桥穿过仿射边界的概率是等于概率,这贝塞尔桥保持低于某个固定值。

英文摘要:

Firstly, we compute the distribution function for the hitting time of a linear time-dependent boundary $t\mapsto a+bt,\ a\geq 0,\,b\in \R,$ by a reflecting Brownian motion. The main tool hereby is Doob's formula which gives the probability that Brownian motion started inside a wedge does not hit this wedge. Other key ingredients are the time inversion property of Brownian motion and the time reversal property of diffusion bridges. Secondly, this methodology can also be applied for the three dimensional Bessel process. Thirdly, we consider Bessel bridges from 0 to 0 with dimension parameter $δ>0$ and show that the probability that such a Bessel bridge crosses an affine boundary is equal to the probability that this Bessel bridge stays below some fixed value.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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