Global Well-Posedness of 2D Non-Focusing Schrödinger Equations via Rigorous Modulation Approximation

Abstract

We consider the long time well-posedness of the Cauchy problem with large Sobolev data for a class of nonlinear Schrödinger equations (NLS) on ${\mathbb{R}}^2$ with power nonlinearities of arbitrary odd degree. Specifically, the method in this paper applies to those NLS equations having either elliptic signature with a defocusing nonlinearity, or else having an indefinite signature. By rigorously justifying that these equations govern the modulation of wave packet-like solutions to an artificially constructed equation with an advantageous structure, we show that a priori every subcritical inhomogeneous Sobolev norm of the solution increases at most polynomially in time. Global well-posedness follows by a standard application of the subcritical local theory.

45 pages. Corrected minor typographical errors, explicitly included Lemma 1.2

References in corpus (3)

• Global well-posedness and scattering for the defocusing, $L^2$-critical, nonlinear Schr{ö}dinger equation when $d=2$
• Global well-posedness and scattering for the defocusing cubic NLS in four dimensions
• Radial standing and self-similar waves for the hyperbolic cubic NLS in 2D