Harnack inequality for non-local Schrödinger operators

Siva Athreya, Koushik Ramachandran

Let $x\in {\mathbb{R}}^d$, $d\ge 3,$ and $f:{\mathbb{R}}^d\to \mathbb{R}$ be a twice differentiable function with all second partial derivatives being continuous. For $1\l…