Suprema of Lévy processes

Mateusz Kwaśnicki, Jacek Małecki, Michał Ryznar

Published 2011-03-04, updated 2013-07-08Version 3

In this paper we study the supremum functional $M_t=\sup_{0\le s\le t}X_s$, where $X_t$, $t\ge0$, is a one-dimensional L\'{e}vy process. Under very mild assumptions we provide a simple, uniform estimate of the cumulative distribution function of $M_t$. In the symmetric case we find an integral representation of the Laplace transform of the distribution of $M_t$ if the L\'{e}vy-Khintchin exponent of the process increases on $(0,\infty)$.