Dispersive estimates for 1D matrix Schr\"odinger operators with threshold resonance

TL;DR

This paper proves dispersive and decay estimates for 1D matrix Schr"odinger operators with threshold resonances, relevant for understanding linearized dynamics around solitary waves in nonlinear Schr"odinger equations.

Contribution

It establishes decay rates for non-self-adjoint matrix Schr"odinger operators with threshold resonances, extending known results to more complex operators arising in nonlinear wave analysis.

Findings

Decay rates match regular case after subtracting finite rank operator

Threshold resonances influence decay behavior but do not alter rates

Structural properties of the quadratic nonlinearity are identified

Abstract

We establish dispersive estimates and local decay estimates for the time evolution of non-self-adjoint matrix Schr\"odinger operators with threshold resonances in one space dimension. In particular, we show that the decay rates in the weighted setting are the same as in the regular case after subtracting a finite rank operator corresponding to the threshold resonances. Such matrix Schr\"odinger operators naturally arise from linearizing a focusing nonlinear Schr\"odinger equation around a solitary wave. It is known that the linearized operator for the 1D focusing cubic NLS equation exhibits a threshold resonance. We also include an observation of a favorable structure in the quadratic nonlinearity of the evolution equation for perturbations of solitary waves of the 1D focusing cubic NLS equation.