Distinctive features of ion-acoustic solitons in electron-positron-ion superdense magnetoplasmas with degenerate electrons and positrons

Using the extended Poincare-Lighthill-Kuo reductive perturbation method to study the small-amplitude ion acoustic solitary wave dynamics (propagation and interaction), it is shown that in the Thomas-Fermi magnetoplasma consisting of inertial-less degenerate electrons and positrons and isothermal ions, distinctive features emerge when the ultrarelativistic degeneracy pressure applies to electrons and positrons. Calculations show that ion-acoustic solitary waves may interact differently in such plasmas under ultrarelativistic degeneracy pressure. (C) 2010 American Institute of Physics. [doi:10.1063/1.3481774]