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Maximal amplitudes of finite-gap solutions for the focusing Nonlinear Schrödinger Equation

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Abstract

Finite-gap (algebro-geometric) solutions to the focusing Nonlinear Schrödinger Equation (fNLS)

$$i \psi_t + \psi_{xx} + 2|\psi|^2\psi=0,$$
(0-1)

are quasi-periodic solutions that represent nonlinear multi-phase waves. In general, a finite-gap solution for (0-1) is defined by a collection of Schwarz symmetrical spectral bands and of real constants (initial phases), associated with the corresponding bands. In this paper we prove an interesting new formula for the maximal amplitude of a finite-gap solution to the focusing Nonlinear Schrödinger equation with given spectral bands: the amplitude does not exceed the sum of the imaginary parts of all the endpoints in the upper half plane. In the case of the straight vertical bands, that amounts to the half of the sum of the length of all the bands. The maximal amplitude will be attained for certain choices of the initial phases. This result is an important part of a criterion for the potential presence of the rogue waves in finite-gap solutions with a given set of spectral endpoints, obtained in Bertola et al. (Proc R Soc A, 2016. doi:10.1098/rspa.2016.0340). A similar result was also obtained for the defocusing Nonlinear Schrödinger equation.

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Authors and Affiliations

  1. Department of Mathematics and Statistics, Concordia University, 1455 de Maisonneuve W., Montreal, QC, H3G 1M8, Canada

    M. Bertola

  2. SISSA/ISAS, Via Bonomea 265, 34136, Trieste, Italy

    M. Bertola

  3. Centre de recherches mathématiques, Université de Montréal, C.P. 6128, succ. centre ville, Montreal, QC, H3C 3J7, Canada

    M. Bertola

  4. Department of Mathematics, University of Central Florida, 4000 Central Florida Blvd., P.O. Box 161364, Orlando, FL, 32816-1364, USA

    A. Tovbis

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  1. M. Bertola
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Correspondence to A. Tovbis.

Additional information

Communicated by P. Deift

Work supported in part by the Natural Sciences and Engineering Research Council of Canada Grant RGPIN-2016-06660.

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Bertola, M., Tovbis, A. Maximal amplitudes of finite-gap solutions for the focusing Nonlinear Schrödinger Equation. Commun. Math. Phys. 354, 525–547 (2017). https://doi.org/10.1007/s00220-017-2895-9

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  • DOI: https://doi.org/10.1007/s00220-017-2895-9

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