A fully discrete low-regularity integrator for the 1D periodic cubic nonlinear Schrödinger equation

Buyang Li, Yifei Wu

Research output: Journal article publicationJournal articleAcademic researchpeer-review


A fully discrete and fully explicit low-regularity integrator is constructed for the one-dimensional periodic cubic nonlinear Schrödinger equation. The method can be implemented by using fast Fourier transform with O(Nln N) operations at every time level, and is proved to have an L2-norm error bound of O(τln(1/τ)+N-1) for H1 initial data, without requiring any CFL condition, where τ and N denote the temporal stepsize and the degree of freedoms in the spatial discretisation, respectively.

Original languageEnglish
Number of pages33
JournalNumerische Mathematik
Publication statusE-pub ahead of print - 21 Aug 2021


  • Fast Fourier transform
  • First-order convergence
  • Low regularity
  • Nonlinear Schrödinger equation
  • Numerical solution

ASJC Scopus subject areas

  • Computational Mathematics
  • Applied Mathematics

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