Nonlinear SDEs driven by Lévy processes and related PDEs

Details Nonlinear SDEs driven by Lévy processes and related PDEs Nonlinear SDEs driven by Lévy processes and related PDEs

2007-07-18

arxiv.org/abs/0707.2723v1

Mathematics

Probability

Scientific paper

In this paper we study general nonlinear stochastic differential equations, where the usual Brownian motion is replaced by a L\'evy process. We also suppose that the coefficient multiplying the increments of this process is merely Lipschitz continuous and not necessarily linear in the time-marginals of the solution as is the case in the classical McKean-Vlasov model. We first study existence, uniqueness and particle approximations for these stochastic differential equations. When the driving process is a pure jump L\'evy process with a smooth but unbounded L\'evy measure, we develop a stochastic calculus of variations to prove that the time-marginals of the solutions are absolutely continuous with respect to the Lebesgue measure. In the case of a symmetric stable driving process, we deduce the existence of a function solution to a nonlinear integro-differential equation involving the fractional Laplacian.

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