no. 4
On the coupling property of Lévy processes
Annales de l'I.H.P. Probabilités et statistiques, Tome 47 (2011) no. 4, pp. 1147-1159.

Nous donnons les conditions nécessaires et suffisantes pour le succès du couplage entre des processus de Lévy (avec partie de sauts non-dégénérée). Notre méthode est basée sur les formules explicites pour le semigroupe de transition d'un processus de Poisson composé, et les résultats de Mineka et Lindvall-Rogers sur le couplage d'une marche aléatoire. En particulier, nous montrons qu'un processus de Lévy admet un couplage, s'il est un processus fortement fellerien ou si la mesure de Lévy (mesure de sauts) possède une composante absolument continue.

We give necessary and sufficient conditions guaranteeing that the coupling for Lévy processes (with non-degenerate jump part) is successful. Our method relies on explicit formulae for the transition semigroup of a compound Poisson process and earlier results by Mineka and Lindvall-Rogers on couplings of random walks. In particular, we obtain that a Lévy process admits a successful coupling, if it is a strong Feller process or if the Lévy (jump) measure has an absolutely continuous component.

DOI : 10.1214/10-AIHP400
Classification : 60G51, 60G50, 60J25, 60J75
Mots clés : coupling property, Lévy processes, compound Poisson processes, random walks, Mineka coupling, strong Feller property 
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Schilling, René L.; Wang, Jian. On the coupling property of Lévy processes. Annales de l'I.H.P. Probabilités et statistiques, Tome 47 (2011) no. 4, pp. 1147-1159. doi : 10.1214/10-AIHP400. http://www.numdam.org/articles/10.1214/10-AIHP400/

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