Global well-posedness and long-time behavior of the fractional NLS

TL;DR

This paper proves probabilistic global well-posedness for the fractional nonlinear Schrödinger equation across all dimensions and regularities, introducing new methods applicable to various Hamiltonian PDEs and periodic settings.

Contribution

It establishes probabilistic GWP results for fractional NLS with energy supercritical nonlinearities, employing novel approaches like the IID limit and Skorokhod theorem.

Findings

Probabilistic GWP for fractional NLS in all dimensions.

Introduction of the IID limit approach for Hamiltonian PDEs.

Extension to periodic settings for smooth regularities.

Abstract

In this paper, our discussion mainly focuses on equations with energy supercritical nonlinearities. We establish probabilistic global well-posedness (GWP) results for the cubic Schr\"odinger equation with any fractional power of the Laplacian in all dimensions. We consider both low and high regularities in the radial setting, in dimension $\geq 2$. In the high regularity result, an {\it Inviscid - Infinite dimensional (IID) limit} is employed while in the low regularity global well-posedness result, we make use of the Skorokhod representation theorem. The IID limit is presented in details as an independent approach that applies to a wide range of Hamiltonian PDEs. Moreover we discuss the adaptation to the periodic settings, in any dimension, for smooth regularities.