Ion-acoustic solitary waves in a dense pair-ion plasma containing degenerate electrons and positrons

U.M. Abdelsalam, W.M. Moslem, P.K. Shukla

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Fully nonlinear propagation of ion-acoustic solitary waves in a collisionless dense/quantum electron-positron-ion plasma is investigated. The electrons and positrons are assumed to follow the Thomas-Fermi density distribution and the ions are described by the hydrodynamic equations. An energy balance-like equation involving a Sagdeev-type pseudo-potential is derived. Finite amplitude solutions are obtained numerically and their characteristics are discussed. The small-but finite-amplitude limit is also considered and an exact analytical solution is obtained. The present studies might be helpful to understand the excitation of nonlinear ion-acoustic solitary waves in a degenerate plasma such as in superdense white dwarfs.
Original languageEnglish
Pages (from-to)4057-4061
Number of pages4
JournalPhysics Letters A
Issue number22
Publication statusPublished - 26 May 2008


  • warm multicomponent plasma
  • solitons
  • generation
  • beam

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