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Bifurcations of ion acoustic solitary and periodic waves in an electron–positron–ion plasma through non-perturbative approach

Published online by Cambridge University Press:  09 April 2014

Asit Saha  and
Prasanta Chatterjee
Asit Saha*
Affiliation:
Department of Mathematics, Sikkim Manipal Institute of Technology, Majitar, Rangpo, East-Sikkim 737136, India Department of Mathematics, Siksha Bhavana, Visva Bharati University, Santiniketan 731235, India
Prasanta Chatterjee*
Affiliation:
Department of Mathematics, Siksha Bhavana, Visva Bharati University, Santiniketan 731235, India
*
†Email address for correspondence: asit_saha123@rediffmail.com, prasantachatterjee1@rediffmail.com
†Email address for correspondence: asit_saha123@rediffmail.com, prasantachatterjee1@rediffmail.com
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Abstract

Ion acoustic solitary waves and periodic waves in an unmagnetized plasma with superthermal (kappa-distributed) electrons and positrons are investigated through a non-perturbative approach. Model equations are transformed to a planar dynamical system. Then by using the bifurcations of phase portraits of this planar dynamical system, we have established that our model has solitary wave and periodic wave solutions. We have obtained two analytical solutions for these solitary and periodic waves depending on the parameters. From these solitary wave and periodic wave solutions, we have shown the combined effects of temperature ratio (σ) of electrons and positrons, spectral index (κ), speed of the traveling wave (v), and density ratio (p) of positrons and electrons on the characteristics of ion acoustic solitary and periodic waves. The spectral index, density ratio, speed of the traveling wave, and temperature ratio significantly affect the characteristics of ion acoustic solitary and periodic structures. The present study might be helpful to understand the salient features of nonlinear ion acoustic solitary and periodic structures in the interstellar medium.

Type
Papers
Information
Journal of Plasma Physics , Volume 80 , Issue 4 , August 2014 , pp. 553 - 563
Copyright
Copyright © Cambridge University Press 2014 

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