Solitary Waves and Dynamics for Subcritical Perturbations of Energy Critical NLS

TL;DR

This paper constructs solitary wave solutions for a perturbed energy-critical NLS in three dimensions and analyzes their stability and dynamics, including scattering and blow-up behaviors based on initial data.

Contribution

It introduces a method to construct solitary waves for subcritical and supercritical perturbations of the energy-critical NLS and characterizes their dynamical outcomes.

Findings

Existence of solitary wave solutions for subcritical and supercritical perturbations.

Identification of conditions leading to scattering or blow-up.

Demonstration of the ground state via variational methods.

Abstract

We consider a perturbed energy critical focusing Nonlinear Schr\"odinger Equation in three dimensions. We construct solitary wave solutions for focusing subcritical perturbations as well as defocusing supercritical perturbations. The construction relies on the resolvent expansion, which is singular due to the presence of a resonance. Specializing to pure power focusing subcritical perturbations we demonstrate, via variational arguments, and for a certain range of powers, the existence of a ground state solitary wave, which is then shown to be the previously constructed solution. Finally, we present a dynamical theorem which characterizes the fate of radially-symmetric solutions whose initial data are below the action of the ground state. Such solutions will either scatter or blow-up in finite time depending on the sign of a certain function of their initial data.