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Almost sure pointwise convergence for the 2D periodic quintic NLS

Daniel Eceizabarrena, Pablo Merino

math.AParXiv:2608.17100

Abstract

We prove probabilistic pointwise convergence to the initial datum for the 2D periodic quintic NLS for data in Hs( T2) with s > 0. This is an improvement with respect to the deterministic setting, in which convergence is known to fail if s < 1/3. The proof is based on a nonlinear maximal characterization for convergence, Bourgain's linear-nonlinear decomposition and the corresponding nonlinear smoothing for which we employ random tensor estimates.

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