Ergodicity for Ginzburg-Landau equation with complex-valued space-time white noise on two-dimensional torus

Abstract: We investigate the ergodicity for the stochastic complex Ginzburg-Landau equation with a general non-linear term on the two-dimensional torus driven by a complex-valued space-time white noise. Due to the roughness of complex-valued space-time white noise, this equation is a singular stochastic partial differential equation and its solution is expected to be a distribution-valued stochastic process. For this reason, the non-linear term is ill-defined and needs to be renormalized. We first use the theory of complex multiple Wiener-Ito integral to renormalize this equation and then consider its global well-posedness. Further, we prove its ergodicity using an asymptotic coupling argument for a large dissipation coefficient.