Dynamics of ion-acoustic waves in Thomas-Fermi plasmas with source term

Dynamics of ion acoustic waves are studied in Thomas-Fermi plasmas with source term consisting of electrons, positrons and positive ions, where electrons and positrons follow zero-temperature Fermi-gas statistics, but ions behave as classical fluid. Using RPT (reductive perturbation technique) the forced KdV and modified KdV equations are obtained. Employing the concept of planar dynamical systems, periodic, quasiperiodic and chaotic features of ion-acoustic waves are studied in Thomas-Fermi plasmas with space debris depending on positron concentration (alpha), speed (nu(d)) of the space debris and strength (f(0)) of source perturbation. The results of this work may have relevance in the Thomas-Fermi plasma environments with space debris. (C) 2019 COSPAR. Published by Elsevier Ltd. All rights reserved.