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arXiv 1012.0817math.PR
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稳定过程的涨落与超几何Levy过程的指数泛函

Fluctuations of stable processes and exponential functionals of hypergeometric Levy processes

Alexey Kuznetsov, Juan Carlos Pardo

摘要:

研究了超几何Levy过程的指数泛函的分布及其性质。我们导出了指数泛函的Mellin变换的显式公式,并给出了它的密度函数的收敛级数展开式和渐近级数展开式。作为应用,我们给出了Kuznetsov“On extrema of stable processes”(2010)和Hubalek and Kuznetsov“A收敛级数representation for the density of the supremum of a stable processes”(2010)关于稳定过程上确界的密度的一些结果的新证明.我们还得到了一些新的结果有关(i)稳定过程的入口律的条件保持积极的,(ii)在其过去的下确界反映的稳定过程的行程测度的入口律和(iii)入口律和最后通过时间的径向部分的n维对称稳定过程.

英文摘要:

We study the distribution and various properties of exponential functionals of hypergeometric Levy processes. We derive an explicit formula for the Mellin transform of the exponential functional and give both convergent and asymptotic series expansions of its probability density function. As applications we present a new proof of some of the results on the density of the supremum of a stable process, which were recently obtained by Kuznetsov "On extrema of stable processes" (2010) and Hubalek and Kuznetsov "A convergent series representation for the density of the supremum of a stable process" (2010). We also derive some new results related to (i) the entrance law of the stable process conditioned to stay positive, (ii) the entrance law of the excursion measure of the stable process reflected at its past infimum and (iii) the entrance law and the last passage time of the radial part of n-dimensional symmetric stable process.

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