Lower bounded semi-Dirichlet forms associated with L\'evy type operators

TL;DR

This paper establishes conditions under which jump kernels define regular lower bounded semi-Dirichlet forms on locally compact spaces, identifies generators in Euclidean space, and relates these to existing approaches in non-local operator theory.

Contribution

It provides simple criteria for semi-Dirichlet forms from jump kernels and explicitly identifies generators and their adjoints in Euclidean spaces, extending prior work.

Findings

Conditions for semi-Dirichlet forms from jump kernels

Explicit generator and adjoint formulas in a9^n

Connection with symmetric principal value approach

Abstract

Let $k:E\times E\to [0,\infty)$ be a non-negative measurable function on some locally compact separable metric space $E$. We provide some simple conditions such that the quadratic form with jump kernel $k$ becomes a regular lower bounded (non-local, non-symmetric) semi-Dirichlet form. If $E=\R^n$ we identify the generator of the semi-Dirichlet form and its (formal) adjoint. In particular, we obtain a closed expression of the adjoint of the stable-like generator $-(-\Delta)^{\alpha(x)}$ in the sense of Bass. Our results complement a recent paper by Fukushima and Uemura (2012) and establishes the relation of these results with the symmetric principal value (SPV) approach due to Zhi-ming Ma and co-authors (2006).