Adding integrable defects to the Boussinesq equation

E. Corrigan, C. Zambon

Research output: Contribution to journalArticlepeer-review


The purpose of this paper is to extend the store of models able to support integrable defects by investigating the two-dimensional Boussinesq nonlinear wave equation. As has been previously noted in many examples, insisting that a defect contributes to energy and momentum to ensure their conservation, despite the presence of discontinuities and the explicit breaking of translation invariance, leads to sewing conditions relating the two fields and their derivatives on either side of the defect. The manner in which several types of soliton solutions to the Boussinesq equation are affected by the defect is explored and reveals new effects that have not been observed in other integrable systems, such as the possibility of a soliton reflecting from a defect or of a defect decaying into one or two solitons.
Original languageEnglish
Article number385701
Number of pages28
JournalJournal of Physics A: Mathematical and Theoretical
Issue number38
Publication statusPublished - 29 Aug 2023

Bibliographical note

28 pages, 9 figures
© 2023 The Author(s)


  • nlin.SI
  • hep-th

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