Abstract
In this paper, we study the law of the local time processes associated to a spectrally negative Lévy process X, in the cases , the first passage time of X above and , the first time it accumulates c units of local time at zero. We describe the branching like structure of local times and Poissonian constructions of them using excursion theory. The presence of jumps for X creates a type of excursions which can contribute simultaneously to local times of levels above and below a given reference point. This fact introduces dependency on local times, causing them to be non-Markovian. Nonetheless, the overshoots and undershoots of excursions will be useful to analyze this dependency. In both cases, local times are infinitely divisible and we give a description of the corresponding Lévy measures in terms of excursion measures. These are hence analogues in the spectrally negative Lévy case of the first and second Ray-Knight theorems, originally stated for the Brownian motion.
Funding Statement
This work is part of the second author’s PhD research project in Centro de Investigación en Matemáticas. This author has been supported by the PhD grant (CVU number 706815) from the National Council of Science and Technology (CONACYT).
Acknowledgments
Both authors thank Dr. Wei Xu for the several insightful discussions about this work. We would like to thank an anonymous referee for their thorough reading of the paper and insightful comments about it.
Citation
Víctor Rivero. Jesús Contreras. "Ray Knight theorems for spectrally negative Lévy processes." Electron. J. Probab. 29 1 - 39, 2024. https://doi.org/10.1214/24-EJP1169
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