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arXiv · 2609.29147

Global well-posedness of defocusing cubic NLS in $M^{\infty,1}(\mathbb{R})$

Friedrich Klaus
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Abstract

We prove global well-posedness of the one-dimensional defocusing cubic nonlinear Schrödinger equation in the modulation space $M^{\infty,1}(\mathbb{R})$. This space imposes no spatial decay and contains $C_b^2(\mathbb{R})$ as well as all absolutely convergent sums of plane waves. The result applies to arbitrary data in this space, including large smooth quasiperiodic profiles and their localized perturbations. The proof constructs a nonnegative density satisfying a local conservation law from forward Weyl ratios, which are defined through half-line square-integrable solutions of the associated spectral problem. A suitable nonlinear combination of localized integrals of this density controls the modulation norm. Finally, choosing the spatial localization scale and NLS scaling in a coordinated way makes the accumulated boundary flux small enough to continue every mild solution globally.

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Friedrich Klaus. 2026-09-24. Global well-posedness of defocusing cubic NLS in $M^{\infty,1}(\mathbb{R})$. https://arxiv.org/abs/2609.29147

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