Almost sure pointwise convergence for the 2D periodic quintic NLS

Abstract

We prove probabilistic pointwise convergence to the initial datum for the 2D periodic quintic NLS for data in $H^s({\mathbb{T}}^2)$ with $s>0$. This is an improvement with respect to the deterministic setting, in which convergence is known to fail if $s<1/3$. The proof is based on a nonlinear maximal characterization for convergence, Bourgain's linear-nonlinear decomposition and the corresponding nonlinear smoothing for which we employ random tensor estimates.