Ergodicity for Time Changed Symmetric Stable Processes

In this paper we study the ergodicity and the related semigroup property for a class of symmetric Markov jump processes associated with time changed symmetric $\alpha$-stable processes. For this purpose, explicit and sharp criteria for Poincar\'{e} type inequalities (including Poincar\'{e}, super Poincar\'{e} and weak Poincar\'{e} inequalities) of the corresponding non-local Dirichlet forms are derived. Moreover, our main results, when applied to a class of one-dimensional stochastic differential equations driven by symmetric $\alpha$-stable processes, yield sharp criteria for their various ergodic properties and corresponding functional inequalities.