Abstract
We study the small-time asymptotics of sample paths of Lévy processes and Lévy-type processes. Namely, we investigate under which conditions the limit
is finite resp. infinite with probability 1. We establish integral criteria in terms of the infinitesimal characteristics and the symbol of the process. Our results apply to a wide class of processes, including solutions to Lévy-driven SDEs and stable-like processes. For the particular case of Lévy processes, we recover and extend earlier results from the literature. Moreover, we present a new maximal inequality for Lévy-type processes, which is of independent interest.
Acknowledgments
I’m grateful to René Schilling and two anonymous referees for their valuable comments, which helped to improve the presentation of this article.
Citation
Franziska Kühn. "Upper functions for sample paths of Lévy(-type) processes." Bernoulli 28 (4) 2874 - 2908, November 2022. https://doi.org/10.3150/21-BEJ1441
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