Positron-acoustic solitons in an electron-positron plasma with beam electrons and kappa-distributed electrons

Electrostatic solitary waves are typically observed in space plasmas containing distinct electron populations with different temperatures. However, electron-positron pairs are also produced in dense high-energy astrophysical plasmas such pulsars and microquasars, leading to the formation of positron-acoustic solitary waves in high-energy environments, where the population of background suprathermal hot electrons does not follow a Maxwellian distribution. Moreover, the presence of magnetic fields in such a plasma leads to the injection of field-aligned beam electrons. In this work, the existence of positron-acoustic solitons is investigated in an electron-positron plasma penetrated by an electron beam, containing inertial positrons, inertial electrons, and background suprathermal hot electrons modeled by a κ-distribution function. A nonlinear pseudopotential method is employed to determine the existence of positron-acoustic solitary waves and their dependence on electron beam, positrons, and electron suprathermality. The results will improve our understanding of electrostatic solitary waves formed in high-energy astrophysical plasmas characterized by electron-positron pairs, magnetic field-aligned beam electrons, and κ-distributed electrons.