Exact and asymptotic n-tuple laws at first and last passage
Kyprianou, A. E. ; Pardo, J. C. ; Rivero, V.
Ann. Appl. Probab., Tome 20 (2010) no. 1, p. 522-564 / Harvested from Project Euclid
Understanding the space–time features of how a Lévy process crosses a constant barrier for the first time, and indeed the last time, is a problem which is central to many models in applied probability such as queueing theory, financial and actuarial mathematics, optimal stopping problems, the theory of branching processes, to name but a few. In Doney and Kyprianou [Ann. Appl. Probab. 16 (2006) 91–106] a new quintuple law was established for a general Lévy process at first passage below a fixed level. In this article we use the quintuple law to establish a family of related joint laws, which we call n-tuple laws, for Lévy processes, Lévy processes conditioned to stay positive and positive self-similar Markov processes at both first and last passage over a fixed level. Here the integer n typically ranges from three to seven. Moreover, we look at asymptotic overshoot and undershoot distributions and relate them to overshoot and undershoot distributions of positive self-similar Markov processes issued from the origin. Although the relation between the n-tuple laws for Lévy processes and positive self-similar Markov processes are straightforward thanks to the Lamperti transformation, by interplaying the role of a (conditioned) stable processes as both a (conditioned) Lévy processes and a positive self-similar Markov processes, we obtain a suite of completely explicit first and last passage identities for so-called Lamperti-stable Lévy processes. This leads further to the introduction of a more general family of Lévy processes which we call hypergeometric Lévy processes, for which similar explicit identities may be considered.
Publié le : 2010-04-15
Classification:  Fluctuation theory,  n-tuple laws,  Lévy process,  conditioned Lévy process,  last passage time,  first passage time,  overshoot,  undershoot,  60G51,  60G50
@article{1268143432,
     author = {Kyprianou, A. E. and Pardo, J. C. and Rivero, V.},
     title = {Exact and asymptotic n-tuple laws at first and last passage},
     journal = {Ann. Appl. Probab.},
     volume = {20},
     number = {1},
     year = {2010},
     pages = { 522-564},
     language = {en},
     url = {http://dml.mathdoc.fr/item/1268143432}
}
Kyprianou, A. E.; Pardo, J. C.; Rivero, V. Exact and asymptotic n-tuple laws at first and last passage. Ann. Appl. Probab., Tome 20 (2010) no. 1, pp.  522-564. http://gdmltest.u-ga.fr/item/1268143432/