Abstract
We implement an infinite iteration scheme of Poincaré-Dulac normal form reductions to establish an energy estimate on the one-dimensional cubic nonlinear Schrödinger equation (NLS) in \({C_tL^2(\mathbb{T})}\), without using any auxiliary function space. This allows us to construct weak solutions of NLS in \({C_tL^2(\mathbb{T})}\) with initial data in \({L^2(\mathbb{T})}\) as limits of classical solutions. As a consequence of our construction, we also prove unconditional well-posedness of NLS in \({H^s(\mathbb{T})}\) for \({s \geq \frac{1}{6}}\).
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Communicated by P. Constantin
Z.G. is supported by the National Science Foundation under agreement No. DMS-0635607 and The S. S. Chern Fund. Any opinions, findings and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation or The S. S. Chern Fund.
S.K. is supported in part by NRF (Korea) grant 2010-0024017 and TJ Park science fellowship.
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Guo, Z., Kwon, S. & Oh, T. Poincaré-Dulac Normal Form Reduction for Unconditional Well-Posedness of the Periodic Cubic NLS. Commun. Math. Phys. 322, 19–48 (2013). https://doi.org/10.1007/s00220-013-1755-5
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DOI: https://doi.org/10.1007/s00220-013-1755-5