On Nonlinear Wave Structures in Plasma Containing Electrons, Ions, Positrons, and Dust Particles with Variable Charges

The possibility of the existence of dust ion-acoustic shock-wave structures associated with anomalous dissipation caused, among other things, by variations in the charges of dust particles in dusty plasma containing, along with electrons and ions, also positrons, is shown. It turns out that the presence of positrons in the plasma expands the region of existence of shock waves, and also reduces the amplitude of the shock wave and increases the width of its front. Moreover, even a small fraction of positrons can have a significant impact on the properties of the shock-wave structure, which is significantly weakened in the presence of positrons. The influence of positrons on shock-wave structures in cosmic dusty plasmas may, in certain situations, modify conclusions regarding the role of shock waves in the formation of stars or the nature of the propagation of shock waves generated by supernova explosions.