Soliton Propagation in a Homogeneous Electron-positron-ion Plasma having Negatively Charged Dust Grains with Drift and Temperature Effects

Abstract

The influence of negatively charged dust grains on soliton characteristics is investigated in a homogeneous electron positron-ion plasma based on the Korteweg-de Vries (KdV) equation obtained using the reductive perturbation technique. The combined effect of dust charge density, ion drift velocity, temperature ratios, and the electron-to-positron density ratio is examined on the soliton characteristics. An increase in the number of negatively charged dust grains significantly modify the medium's nonlinear and dispersive properties, leading to a decrease in soliton amplitude and an increase in its width. When the electron-to-positron density ratio increases, the soliton profile becomes noticeably broader, and its amplitude decreases. This dependence highlights the role of dust grains in altering the soliton dynamics within the electron-positronion plasma. Thermal effects and ion drift enhance the soliton propagation and retaining its shape. These findings provide a more comprehensive understanding of nonlinear wave structures in multi-component dusty pair plasmas relevant to both laboratory and astrophysical environments.