Bilinear controllability for the linear KdV-Schr{\"o}dinger equation

TL;DR

This paper proves small-time global approximate controllability of a linear KdV-Schrödinger equation on a torus using purely imaginary bilinear controls across Fourier modes.

Contribution

It introduces a novel controllability result for the KdV-Schrödinger system via the saturation method, combining phase multiplications and transport operators.

Findings

Achieved small-time controllability for phase multiplications.

Generated transport operators associated with torus diffeomorphisms.

Established controllability independent of the Schrödinger component.

Abstract

We study the controllability of a linear KdV-Schr{\"o}dinger equation on the one-dimensional torus via purely imaginary bilinear controls. Considering controls spanning a suitable finite number of Fourier modes, we prove small-time global approximate controllability in L2(T). The result holds between any pair of states with the same norm and is obtained via the saturation method by following the idea introduced in [Poz24]. We first establish small-time controllability for phase multiplications, and then generate transport operators associated with diffeomorphisms of the torus. Finally, we combine these results to recover global approximate controllability. Note that the controllability property holds independently of the Schr{\"o}dinger component of the dynamics, which may in particular be taken to vanish.