Harnack Inequalities for Ornstein-Uhlenbeck Processes Driven by L\'{e}vy   Processes
  By using the existing sharp estimates of density function for rotationally invariant symmetric $\alpha$-stable L\'{e}vy processes and rotationally invariant symmetric truncated $\alpha$-stable L\'{e}vy processes, we obtain that Harnack inequalities hold for rotationally invariant symmetric $\alpha$-stable L\'{e}vy processes with $\alpha\in(0,2)$ and Ornstein-Uhlenbeck processes driven by rotationally invariant symmetric $\alpha$-stable L\'{e}vy process, while logarithmic Harnack inequalities are satisfied for rotationally invariant symmetric truncated $\alpha$-stable L\'{e}vy processes. 
Jian Wang
math.PR