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

Abdelsalam, U.M. and Moslem, W.M. and Shukla, P.K. (2008) Ion-acoustic solitary waves in a dense pair-ion plasma containing degenerate electrons and positrons. Physics Letters A, 372 (22). pp. 4057-4061. ISSN 0375-9601 (http://dx.doi.org/10.1016/j.physleta.2008.02.086)

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Abstract

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.

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