Ion-Acoustic Solitary Waves in a Partially Degenerate Plasma

The propagation of arbitrary amplitude ion-acoustic (IA) solitary waves (SWs) is studied in unmagnetized, collisionless, homogeneous electron-positron-ion (e-p-i) plasmas with finite temperature degeneracy both electrons and positrons. Starting from a set fluid equations for classical ions Fermi-Dirac distribution degenerate positrons, linear dispersion relation IA derived. It seen that the wave significantly modified due to presence positron species effects In nonlinear regime, Sagdeev's pseudopotential approach employed study existence domain evolution IA-SWs terms parameters are associated degeneracy, background number densities, thermal energies found contrast electron-ion subsonic supersonic can exist partially e-p-i plasma.