Two simple criterion to obtain exact controllability and stabilization of a linear family of Dispersive PDE's on a periodic domain

In this work, we use the classical moment method to find a practical and simple criterion to determine if a family of linearized Dispersive equations on a periodic domain is exactly controllable and exponentially stabilizable with any given decay rate in $H_p^s(\mathbb{T})$ with $s\in \mathbb{R}$. We apply these results to prove that the linearized Smith equation, the linearized dispersion-generalized Benjamin-Ono equation, the linearized fourth-order Schr"odinger equation, and the Higher-order Schr"odinger equations are exactly controllable and exponentially stabilizable with any given decay rate in $H_p^s(\mathbb{T})$ with $s\in \mathbb{R}$.