Abstract
Let \(\Phi \) be a nuclear space and let \(\Phi '_{\beta }\) denote its strong dual. In this work, we prove the existence of càdlàg versions, the Lévy–Itô decomposition and the Lévy–Khintchine formula for \(\Phi '_{\beta }\)-valued Lévy processes. Moreover, we give a characterization for Lévy measures on \(\Phi '_{\beta }\) and provide conditions for the existence of regular versions to cylindrical Lévy processes in \(\Phi '\). Furthermore, under the assumption that \(\Phi \) is a barrelled nuclear space we establish a one-to-one correspondence between infinitely divisible measures on \(\Phi '_{\beta }\) and Lévy processes in \(\Phi '_{\beta }\). Finally, we prove the Lévy–Khintchine formula for infinitely divisible measures on \(\Phi '_{\beta }\).
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Acknowledgements
The author would like to thank David Applebaum for all his helpful comments and suggestions. Thanks also to the University of Costa Rica for providing financial support through the Grant 820-B6-202 “Ecuaciones diferenciales en derivadas parciales en espacios de dimensión infinita.” Some earlier parts of this work were carried out at the University of Sheffield and the author wishes to express his gratitude. Many thanks are also due to the referees, who made very helpful remarks.
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Fonseca-Mora, C.A. Lévy Processes and Infinitely Divisible Measures in the Dual of a Nuclear Space. J Theor Probab 33, 649–691 (2020). https://doi.org/10.1007/s10959-019-00972-3
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DOI: https://doi.org/10.1007/s10959-019-00972-3
Keywords
- Lévy processes
- Infinitely divisible measures
- Cylindrical Lévy processes
- Dual of a nuclear space
- Lévy–Itô decomposition
- Lévy–Khintchine formula
- Lévy measure