The Open Plasma Physics Journal

2015, 8 : 8-22
Published online 2015 January 30. DOI: 10.2174/1876534301508010008
Publisher ID: TOPPJ-8-8

Large Amplitude Dust-acoustic Solitons in a Plasma Consisting of Superthermal Electron-positron Pairs and Dust Particulates

E. Saberian , A. Esfandyari-Kalejahi and M. Afsari-Ghazi
Department of Physics, Faculty of Basic Sciences, University of Neyshabur, P.O. Box 91136-599, Neyshabur, Iran.

ABSTRACT

The occurrence and propagation of large amplitude dust-acoustic solitary waves (DASWs) are studied in a three-component plasma consisting of negatively charged dust grains and electron-positron pairs by employing a pseudopotential technique. Here, we focus on a superthermal plasma modeled by a = κ -like distribution and consider a finite temperature for dust particulates. It is shown that the solitary waves with negative polarity are allowed in the system and there is a critical value for dust charge Zd above/below which the subsonic/supersonic solitary structures can propagate. In the case of negative fullerene ions, Zd = 1, it is observed that subsonic DASWs can propagate in the plasma. In addition, it is revealed that the propagation of double layers is not possible in this plasma system.

Keywords:

Ion-acoustic solitary wave, Kappa distribution, Superthermal particle, Sagdeev pseudo-potential.