The longitudinal plasma modes in mDM-plasma system

Abstract

In the present paper, the dispersions and Landau damping of the ion acoustic waves in the dark plasma system with non-extensive distributed millicharged dark matter particles are investigated under the kinetic theory regimes. The result shows that the peculiarities of the Landau damping of the waves depend on the parameter q of the distribution function. However, the growth rate due to the streaming dark matter is acutely tiny compared to the damping rates arising from the electrons and ions. As a result, both Maxwellian and non-extensive distributions are strongly damped by the dark matter. Hence, the waves cannot be stimulated yet.