Boundary Harnack principle for diffusion with jumps on metric measure spaces

Abstract

A non-scale invariant BHP on any open set is obtained for a large class of discontinuous Hunt processes on metric measure spaces that are in weak duality with another Hunt process under suitable conditions in terms of estimates of exit distributions from open sets, and bounds on Green functions and the comparability of the jump density function. These conditions are easy to verify in concrete cases. Several examples are given to illustrate the main results and the new contributions of this paper. Our result in particular establishes the BHP on any open set for any Hunt process associated with a regular symmetric Dirichlet form on a metric measure space having both the strongly local term and the pure-jump term that admits a two-sided heat kernel estimates of the mixture of (sub-)Gaussian and stable-like form, as well as for a wide class of non-symmetric diffusion processes with jumps on $\mathbb R^d.$