Numerical computation for backward doubly SDEs with random terminal time

摘要

In this article, we are interested in solving numerically backward doubly stochastic differential equations (BDSDEs) with random terminal time t. The main motivations are giving a probabilistic representation of the Sobolev's solution of Dirichlet problem for semilinear SPDEs and providing the numerical scheme for such SPDEs. Thus, we study the strong approximation of this class of BDSDEs when t is the first exit time of a forward SDE from a cylindrical domain. Euler schemes and bounds for the discrete-time approximation error are provided.