Symplectic Finite Difference Approximations of the Nonlinear Klein-Gordon Equation

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Abstract

We analyze three finite difference approximations of the nonlinear Klein-Gordon equation and show that they are directly related to symplectic mappings. Two of the schemes, the Perring-Skyrme and Ablowitz-Kruskal-Ladik, are long established, and the third is a new, higher order accurate scheme. We test the schemes on traveling wave and periodic breather problems over long time intervals and compare their accuracy and computational costs with those of symplectic and nonsymplectic method-of-lines approximations and a nonsymplectic energy conserving method.

Original languageEnglish
Pages (from-to)1742-1760
Number of pages19
JournalSIAM Journal on Numerical Analysis
Volume34
Issue number5
Publication statusPublished - 1997

Keywords

  • Finite differences
  • Klein-Gordon equation
  • Symplectic approximations

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