Ergodicity for the stochastic quantization problems on the 2D-torus
  In this paper we study the stochastic quantization problem on the two dimensional torus and establish ergodicity for the solutions. Furthermore, we prove a characterization of the $\Phi^4_2$ quantum field on the torus in terms of its density under translation. We also deduce that the $\Phi^4_2$ quantum field on the torus is an extreme point in the set of all $L$-symmetrizing measures, where $L$ is the corresponding generator. 
Michael Rockner, Rongchan Zhu, Xiangchan Zhu
math.PR math-ph math.AP math.MP