Abstract

This work focuses on two-dimensional (2D) quasi-periodically forced nonlinear Schrödinger equations. This means studying iut−Δu+μu+εϕ(t)(u+|u|2u)=0,μ≥0,x∈T2,t∈R with periodic boundary conditions, where ε is a small positive parameter, ϕ(t) is a real analytic quasi-periodic function in t with frequency vector ω=(ω1,ω2…,ωm). It is shown that, under suitable hypothesis on ϕ(t), there are many quasi-periodic solutions for the above equation via KAM theory.

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