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The final state problem for the nonlinear Schrödinger equation in dimensions 1, 2 and 3

Andrew Hassell and Qiuye Jia

Vol. 8 (2026), No. 1, 1–39
Abstract

We consider the defocusing nonlinear Schrödinger equation, with time-dependent potential, in space dimensions n = 1,2 and 3, with nonlinearity |u|p1u, p an odd integer, satisfying p 5 in dimension 1, p 3 in dimension 2 and p = 3 in dimension 3. We also allow a metric perturbation, assumed to be compactly supported in spacetime, and nontrapping. We work with module regularity spaces, which are defined by regularity of order k 2 under the action of certain vector fields generating symmetries of the free Schrödinger equation. We solve the large data final state problem, with final state in a module regularity space, and show convergence of the solution to the final state.

Keywords
nonlinear Schrödinger equation, final state, asymptotics, module regularity variable coefficients
Mathematical Subject Classification
Primary: 35Q41, 35Q55
Secondary: 35P25, 35S05
Milestones
Received: 22 December 2024
Revised: 20 July 2025
Accepted: 27 October 2025
Published: 12 December 2025
Authors
Andrew Hassell
Mathematical Sciences Institute
Australian National University
Canberra, ACT
Australia
Qiuye Jia
Mathematical Sciences Institute
Australian National University
Canberra, ACT
Australia