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Regularity of local times associated with Volterra–Lévy processes and path-wise regularization of stochastic differential equations
Regularity of local times associated with Volterra–Lévy processes and path-wise regularization of stochastic differential equations
Harang, Fabian A.; Ling, Chengcheng
AG Stochastik und Finanzmathematik
We investigate the space-time regularity of the local time associated with Volterra–Lévy processes, including Volterra processes driven by α-stable processes for α∈(0,2]. We show that the spatial regularity of the local time for Volterra–Lévy process is P-a.s. inverse proportional to the singularity of the associated Volterra kernel. We apply our results to the investigation of path-wise regularizing effects obtained by perturbation of ordinary differential equations by a Volterra–Lévy process which has sufficiently regular local time. Following along the lines of Harang and Perkowski (2020), we show existence, uniqueness and differentiability of the flow associated with such equations.
