Reducibility of linear quasi-periodic Hamiltonian derivative wave equations and half-wave equations under the Brjuno conditions

Abstract

In this paper, we prove the reducibility for some linear quasi-periodic Hamiltonian derivative wave and half-wave equations under the Brjuno-Rüssmann non-resonance conditions. This generalizes KAM theory by Pöschel in [38] from the finite dimensional Hamiltonian systems to Hamiltonian PDEs.