Initial perturbations and Langmuir waves in electron-positron plasma

The evolution of the initial density and velocity perturbations of a different type in the electron-positron plasma was studied in the numerical experiments (PIC-method). It was shown that the different perturbations lead to the excitation of the Langmuir wave and (or) the quasineutral density perturbation. It is shown that electron-positron plasma can be used as a model of the plasma of the equal mass negative and positive ions.