Fluctuations of stable processes and exponential functionals of hypergeometric Levy processes

Details Fluctuations of stable processes and exponential functionals of hypergeometric Levy processes Fluctuations of stable processes and exponential functionals of hypergeometric Levy processes

2010-12-03

arxiv.org/abs/1012.0817v1

Mathematics

Probability

26 pages

Scientific paper

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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