Strong Instability of Solitary Waves for Inhomogeneous Nonlinear
Schrödinger Equations
Abstract
This paper studies the inhomogeneous nonlinear Schrödinger equations,
which may model the propagation of laser beams in nonlinear optics.
Using the cross-constrained variational method, a sharp condition for
global existence is derived. Then, by solving a variational problem, the
strong instability of solitary waves of this equation is proved.