The convex minorant of a Lévy process

• Autores: Jim Pitman, Gerónimo Uribe Bravo
• Localización: Annals of probability: An official journal of the Institute of Mathematical Statistics, ISSN 0091-1798, Vol. 40, Nº. 4, 2012, págs. 1636-1674
• Idioma: inglés
• DOI: 10.1214/11-AOP658
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• Resumen

  • We offer a unified approach to the theory of convex minorants of Lévy processes with continuous distributions. New results include simple explicit constructions of the convex minorant of a Lévy process on both finite and infinite time intervals, and of a Poisson point process of excursions above the convex minorant up to an independent exponential time. The Poisson–Dirichlet distribution of parameter 1 is shown to be the universal law of ranked lengths of excursions of a Lévy process with continuous distributions above its convex minorant on the interval [0,1].