Effects of trapped electrons on the oblique propagation of ion acoustic solitary waves in electron-positron-ion plasmas

2016 ◽  
Vol 23 (8) ◽  
pp. 082904 ◽  
Author(s):  
M. G. Hafez ◽  
N. C. Roy ◽  
M. R. Talukder ◽  
M. Hossain Ali
Keyword(s):  
Solitary Waves ◽  
Trapped Electrons ◽  
Oblique Propagation ◽  
Electron Positron ◽  
Ion Acoustic Solitary Waves ◽  
Ion Acoustic

scholarly journals Propagation of ion-acoustic solitary waves in a relativistic electron-positron-ion plasma

2011 ◽  
Vol 89 (3) ◽  
pp. 299-309 ◽  
Author(s):  
E. Saberian ◽  
A. Esfandyari-Kalejahi ◽  
M. Akbari-Moghanjoughi
Keyword(s):  
Solitary Wave ◽  
Relativistic Electron ◽  
Solitary Waves ◽  
Thermal Energy ◽  
Large Amplitude ◽  
Considerable Effect ◽  
Potential Well ◽  
Electron Positron ◽  
Ion Acoustic Solitary Waves ◽  
Ion Acoustic

The propagation of large amplitude ion-acoustic solitary waves (IASWs) in a fully relativistic plasma consisting of cold ions and ultra-relativistic hot electrons and positrons is investigated using the Sagdeev pseudopotential method in a relativistic hydrodynamics model. The effects of streaming speed of the plasma fluid, thermal energy, positron density, and positron temperature on large amplitude IASWs are studied by analysis of the pseudopotential structure. It is found that in regions in which the streaming speed of the plasma fluid is larger than that of the solitary wave, by increasing the streaming speed of the plasma fluid, the depth and width of the potential well increase, resulting in narrower solitons with larger amplitude. This behavior is opposite to the case where the streaming speed of the plasma fluid is less than that of the solitary wave. On the other hand, an increase in the thermal energy results in wider solitons with smaller amplitude, because the depth and width of the potential well decrease in that case. Additionally, the maximum soliton amplitude increases and the width becomes narrower as a result of an increase in positron density. It is shown that varying the positron temperature does not have a considerable effect on the width and amplitude of IASWs. The existence of stationary soliton-like arbitary amplitude waves is also predicted in fully relativistic electron-positron-ion (EPI) plasmas. The effects of streaming speed of the plasma fluid, thermal energy, positron density, and positron temperature on these kinds of solitons are the same for large amplitude IASWs.

Head-on collision of ion acoustic solitary waves in an electron-positron-ion plasma with superthermal electrons

2010 ◽  
Vol 17 (12) ◽  
pp. 122314 ◽  
Author(s):  
Prasanta Chatterjee ◽  
Uday narayan Ghosh ◽  
Kaushik Roy ◽  
S. V. Muniandy ◽  
C. S. Wong ◽  
...  
Keyword(s):  
Solitary Waves ◽  
Superthermal Electrons ◽  
Ion Plasma ◽  
Electron Positron ◽  
Ion Acoustic Solitary Waves ◽  
Ion Acoustic

Nonlinear structure of ion-acoustic solitary waves in a relativistic degenerate electron–positron–ion plasma

2011 ◽  
Vol 78 (2) ◽  
pp. 133-141 ◽  
Author(s):  
A. RASHEED ◽  
N. L. TSINTSADZE ◽  
G. MURTAZA ◽  
R. CHAUDHARY
Keyword(s):  
Solitary Waves ◽  
Acoustic Waves ◽  
Number Range ◽  
Thomas Fermi ◽  
Ion Plasma ◽  
Electron Positron ◽  
Ion Acoustic Solitary Waves ◽  
Ion Acoustic ◽  
Arbitrary Amplitude ◽  
Pseudo Potential

AbstractArbitrary amplitude and small amplitude ion-acoustic solitary waves (IASWs) have been investigated in a relativistic, collisionless, unmagnetized, and degenerate dense electron–positron–ion plasma. The arbitrary amplitude IASWs have been studied by using the Sagdeev-type pseudo-potential approach. Along with approximate solution, the exact amplitude solitary structure has also been studied numerically. The electrons and positrons are assumed to follow the corresponding Fermi distribution function and the ions are described by the hydrodynamic equations. A new dispersion relation for the ion-acoustic wave has been derived for the relativistic Thomas–Fermi plasma. An energy balance-like equation involving the Sagdeev-type pseudo-potential has been investigated and it has been shown that the concentration of plasma particles has significant effect on the permitted Mach number range of IASWs. Also, it has been pointed out that the only compressional supersonic IASWs can propagate in the relativistic Thomas–Fermi plasma. The present work would be helpful to understand the excitation of the nonlinear ion-acoustic waves in a degenerate plasma, such as in superdense white dwarfs and in the cores of massive planets.

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