dc.contributor.author Rivero, Víctor Manuel dc.contributor.author Haas, Bénédicte dc.date.accessioned 2011-10-26T13:50:59Z dc.date.available 2011-10-26T13:50:59Z dc.date.issued 2012 dc.identifier.uri https://basepub.dauphine.fr/handle/123456789/7336 dc.language.iso en en dc.subject Lévy processes en dc.subject exponential functionals of Lévy processes en dc.subject extreme value theory en dc.subject quasi-sationary distributions en dc.subject Yaglom limits en dc.subject self-similar Markov processes en dc.subject.ddc 519 en dc.title Quasi-stationary distributions and Yaglom limits of self-similar Markov processes en dc.type Article accepté pour publication ou publié dc.contributor.editoruniversityother CIMAT (CIMAT);Mexique dc.description.abstracten We discuss the existence and characterization of quasi-stationary distributions and Yaglom limits of self-similar Markov processes that reach 0 in finite time. By Yaglom limit, we mean the existence of a deterministic function $g$ and a non-trivial probability measure $\nu$ such that the process rescaled by $g$ and conditioned on non-extinction converges in distribution towards $\nu$. If the study of quasi-stationary distributions is easy and follows mainly from a previous result by Bertoin and Yor \cite{BYFacExp} and Berg \cite{bergI}, that of Yaglom limits is more challenging. We will see that a Yaglom limit exits if and only if the extinction time at $0$ of the process is in the domain of attraction of an extreme law and we will then treat separately three cases, according whether the extinction time is in the domain of attraction of a Gumbel law, a Weibull law or a Fréchet law. In each of these cases, necessary and sufficient conditions on the parameters of the underlying Lévy process are given for the extinction time to be in the required domain of attraction. The limit of the process conditioned to be positive is then characterized by a multiplicative equation which is connected to a factorization of the exponential distribution in the Gumbel case, a factorization of a Beta distribution in the Weibull case and a factorization of a Pareto distribution in the Fréchet case. This approach relies partly on results on the tail distribution of the extinction time, which is known to be distributed as the exponential integral of a Lévy process. In that aim, new results on such tail distributions are given, which may be of independent interest. Last, we present applications of the Fréchet case to a family of Ornstein-Uhlenbeck processes. en dc.relation.isversionofjnlname Stochastic Processes and their Applications dc.relation.isversionofjnlvol 122 dc.relation.isversionofjnlissue 12 dc.relation.isversionofjnldate 2012 dc.relation.isversionofjnlpages 4054-4095 dc.relation.isversionofdoi http://dx.doi.org/10.1016/j.spa.2012.08.006 dc.identifier.urlsite http://hal.archives-ouvertes.fr/hal-00634425/fr/ en dc.description.sponsorshipprivate oui en dc.relation.isversionofjnlpublisher Elsevier dc.subject.ddclabel Probabilités et mathématiques appliquées en
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