Electron Beam-Plasma Interaction in an Electron-Positron Plasma System with Kappa-Distributed Electrons

Interaction of a beam of electrons with the background electrons commonly occurs in high-energy astrophysical plasmas such as active galactic nuclei, supernovas, and pulsar environments, where positrons are also present. Previously, we have studied the properties of electrostatic solitary waves in two plasma models containing kappa-distributed electrons: one with electron beam, 1 and another one with positrons. 2 In the present study, we determine the existence domains of positron-acoustic solitary waves in a three-fluid plasma model consisting of a positrons fluid, a cold electron fluid, an electron beam fluid, and background electrons modeled by a kappa-distribution function. The Sagdeev pseudopotential approach was employed to investigate the occurrence of positron-acoustic solitons. We have explored how the properties of positron-acoustic solitons are influenced by the electron beam and kappa-distributed electrons. These results broaden our understanding of the formation of positron-acoustic solitary waves in high-energy astrophysics supported by kappa-distributed and beam electrons.