Orbital stability of solitary wave solutions of the derivative nonlinear Schrödinger equation in the endpoint case

Jia Shen, Yifei Wu, Changping Yang

In this paper, we consider the orbital stability of solitary waves for the derivative nonlinear Schrödinger equation $$iq_t+q_{xx}+i\partial_x\bigl(|q|^2q\bigr)=0, \quad (t,x)\in\m…