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Integrable discretization of nonlinear Schrödinger equation and its application with Fourier pseudo-spectral method

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Abstract

A new integrable discretization of the nonlinear Schr¨odinger (NLS) equation is presented. Different from the one given by Ablowitz and Ladik, we discretize the time variable in this paper. The new discrete system converges to the NLS equation when we take a standard limit and has the same scattering operator as the original NLS equation. This indicates that both the new system and the NLS equation possess the same set of infinite conservation quantities. By applying the Fourier pseudo-spectral method to the space variable, we calculate the first five conservation quantities at different times. The numerical results indeed verify the conservation properties.

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Authors and Affiliations

  1. Institute of Computational Mathematics and Scientific Engineering Computing, Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing, China

    Y. Zhang & X. B. Hu

  2. Department of Computer Science, Hong Kong Baptist University, Hongkong, China

    H. W. Tam

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  1. Y. Zhang
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  2. X. B. Hu
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Zhang, Y., Hu, X.B. & Tam, H.W. Integrable discretization of nonlinear Schrödinger equation and its application with Fourier pseudo-spectral method. Numer Algor 69, 839–862 (2015). https://doi.org/10.1007/s11075-014-9928-7

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