Abstract
A theoretical investigation has been made for modulational instability of ion-acoustic waves in an electron-positron-ion plasma with nonthermal electrons. Employing reductive perturbation method (RPM), the nonlinear Schrödinger equation (NLSE) is derived. The dispersive and nonlinearity coefficients, P and Q, respectively, are the functions of nonthermal parameter (β), ratio of positron to electron density (d), ratio of the electron to positron temperature (δ) and ratio of ion to electron temperature (σ). It is observed that these parameters significantly modify the conditions of the modulational instability. The system supports both types of bright and dark envelope excitations.
Original language | English |
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Pages (from-to) | 3210-3215 |
Number of pages | 6 |
Journal | Physics Letters, Section A: General, Atomic and Solid State Physics |
Volume | 374 |
Issue number | 31-32 |
DOIs | |
State | Published - Jul 12 2010 |
Externally published | Yes |
Funding
Authors are thankful to the referee for his/her valuable comments to improve the quality of this Letter. This work is supported by Department of Science and Technology, India , under project No. SR/S4/AS: 245/05 . N.S.S. gratefully acknowledges the research fellowship provided by Queen's University Belfast, UK .
Keywords
- Electron-positron-ion plasma
- Envelope soliton
- Ion acoustic wave
- Modulation instability