Dust ion acoustic solitary structures in presence of nonthermally distributed electrons and positrons

TL;DR

This paper investigates dust ion acoustic solitary structures in a dusty plasma with nonthermal electrons and positrons, revealing new types of solitary waves and supersolitons, and analyzing their formation and transition dynamics.

Contribution

It extends previous models by considering nonthermal positrons, providing a more generalized analysis of solitary structures and their existence domains.

Findings

Presence of both positive and negative potential double layers.

Coexistence of solitary waves of both polarities.

Formation and transition of supersolitons analyzed via phase portraits.

Abstract

The purpose of this paper is to extend the recent work of Paul & Bandyopadhyay [Astrophys. Space Sci. 361, 172(2016)] on the existence of different dust ion acoustic solitary structures in an unmagnetized collisionless dusty plasma consisting of negatively charged static dust grains, adiabatic warm ions, nonthermal electrons and isothermal positrons in a more generalized form by considering nonthermal positrons instead of isothermal positrons. The present system supports both positive and negative potential double layers, coexistence of solitary waves of both polarities and positive potential supersolitons. The qualitative and the quantitative changes in existence domains of different solitary structures which occur for the presence of nonthermal positrons have been presented in comparison with the results of Paul & Bandyopadhyay [Astrophys. Space Sci. 361, 172(2016)]. The formation of supersoliton structures and their limitations have been analyzed with the help of phase portraits of the dynamical system corresponding to the dust ion acoustic solitary structures. Phase portrait analysis clearly indicates a smooth transition between soliton and supersoliton.