Theory of cavitons in complex plasmas

Padma Shukla, Bengt Eliasson, Ingmar Sandberg

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


Nonlinear coupling between Langmuir waves with finite amplitude dispersive dust acoustic perturbations is considered. It is shown that the interaction is governed by a pair of coupled nonlinear differential equations. Numerical results reveal the formation of Langmuir envelope solitons composed of the dust density depression created by the ponderomotive force of bell-shaped Langmuir wave envelops. The associated ambipolar potential is positive. The present nonlinear theory should be able to account for the trapping of large amplitude Langmuir waves in finite amplitude dust density holes. This scenario may appear in Saturn’s dense rings, and the Cassini spacecraft should be able to observe fully nonlinear cavitons, as presented herein. Furthermore, we propose that new electron-beam plasma experiments should be conducted to verify our theoretical prediction.
Original languageEnglish
Article number075005
Number of pages4
JournalPhysical Review Letters
Issue number7
Publication statusPublished - 15 Aug 2003


  • complex plasmas
  • dusty plasmas
  • cavitons


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