Scattering theory below energy space for two dimensional nonlinear Schr\"odinger equation

TL;DR

This paper demonstrates global well-posedness and scattering for low-regularity solutions of a two-dimensional nonlinear Schrödinger equation using the I-method and interaction Morawetz estimates, even for non-scale-invariant cases.

Contribution

It is the first to establish such results for a non-scale-invariant nonlinear Schrödinger equation in two dimensions.

Findings

Proved global well-posedness for low-regularity solutions.

Established scattering behavior under certain parameter conditions.

Extended previous results to a broader range of nonlinearities.

Abstract

The purpose of this paper is to illustrate the I-method by studying low-regularity solutions of the nonlinear Schr\'[o]dinger equation in two space dimensions. By applying this method, together with the interaction Morawetz estimate, (see [J. Colliander, M. Grillakis and N. Tzirakis, Tensor products and correlation estimates with applications to nonlinear Schr\"{o}dinger equations, Commun. Pure Appl. Math. 62(2009)920-968; F. Planchon and L. Vega, Bilinear virial identities and applications, Ann. Sci. Ecole Norm. Sup. 42(2009)261-290]), establish global well-posedness and scattering for low-regularity solutions of the equation $iu_t + \Delta u = \lambda _1|u|^{p_1} u + \lambda _2|u|^{p_2} u$ under certain assumptions on parameters. This is the first result of this type for an equation which is not scale-invariant. In the first step, we establish global well-posedness and scattering for low regularity solutions of the equation $iu_t + \Delta u = |u|^p u$, for a suitable range of the exponent $p$ extending the result of Colliander, Grillakis and Tzirakis [Commun. Pure Appl. Math. 62(2009)920-968].