Obliquely propagating dust ion-acoustic solitary waves and double layers in multicomponent plasmas

Abstract

This research work deals with the propagation characteristics of dust ion-acoustic solitary waves and double layers in a strongly magnetized and rotating plasma comprising of fluid ions, charged dust, superthermal electrons, and positrons. In small amplitude approximation, reductive perturbation technique is employed to derive the Korteweg-de Vries (KdV) equation, and its analytical solution is presented. The combined effects of variation of different plasma parameters like superthermality, dust concentration, magnetic field strength, and rotation of a plasma on the amplitude and width of dust ion-acoustic solitons are analyzed. Both positive and negative potential solitary waves occur in this dusty plasma system. The critical values of plasma parameters for which KdV model is not valid, are examined, and the modified KdV (mKdV) equation is derived. The existence regimes of mKdV solitons and double layers have also been investigated. Positive and negative potential double layers occur in the present plasma system.