Coherent nonlinear structures in dense electron-positron plasma

doi:10.1088/1674-1056/22/2/025201

中国物理B ›› 2013, Vol. 22 ›› Issue (2): 25201-025201.doi: 10.1088/1674-1056/22/2/025201

• PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES • 上一篇下一篇

Coherent nonlinear structures in dense electron-positron plasma

S. A. Khan^a, Z. Wazir^b

a National Centre for Physics, Quaid-i-Azam University Campus, Islamabad 45320, Pakistan;
b Department of Physics, International Islamic University, Islamabad, Pakistan

收稿日期:2012-03-30 修回日期:2012-08-07 出版日期:2013-01-01 发布日期:2013-01-01

Coherent nonlinear structures in dense electron-positron plasma

S. A. Khan^a, Z. Wazir^b

a National Centre for Physics, Quaid-i-Azam University Campus, Islamabad 45320, Pakistan;
b Department of Physics, International Islamic University, Islamabad, Pakistan

Received:2012-03-30 Revised:2012-08-07 Online:2013-01-01 Published:2013-01-01
Contact: S. A. Khan E-mail:sakhan@ncp.edu.pk

摘要/Abstract

摘要： It is shown that the rarefactive-type double layer structures exist in ultradense electron-positron plasma. For this purpose, an extended Korteweg de Vries equation is derived and solved analytically in low amplitude limit by employing the appropriate fluid equations. Strong influence of quantum degeneracy pressure of electrons and positrons, quantum diffraction effects and concentration of background positive ions on double layer is noticed. It is also pointed out that the amplitude and steepness of double layer increases with increase in ion concentration or ion charge number. The results are examined numerically for some interesting cases of dense plasmas with illustrations.

关键词: degenerate plasma, nonlinear structures, double layers

Abstract: It is shown that the rarefactive-type double layer structures exist in ultradense electron-positron plasma. For this purpose, an extended Korteweg de Vries equation is derived and solved analytically in low amplitude limit by employing the appropriate fluid equations. Strong influence of quantum degeneracy pressure of electrons and positrons, quantum diffraction effects and concentration of background positive ions on double layer is noticed. It is also pointed out that the amplitude and steepness of double layer increases with increase in ion concentration or ion charge number. The results are examined numerically for some interesting cases of dense plasmas with illustrations.

Key words: degenerate plasma, nonlinear structures, double layers

中图分类号: (Basic studies of specific kinds of plasmas)

52.27.-h

52.27.Ep (Electron-positron plasmas) 52.35.Fp (Electrostatic waves and oscillations (e.g., ion-acoustic waves)) 52.35.Mw (Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.))

S. A. Khan, Z. Wazir. Coherent nonlinear structures in dense electron-positron plasma[J]. 中国物理B, 2013, 22(2): 25201-025201.

S. A. Khan, Z. Wazir. Coherent nonlinear structures in dense electron-positron plasma[J]. Chin. Phys. B, 2013, 22(2): 25201-025201.

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Coherent nonlinear structures in dense electron-positron plasma

Coherent nonlinear structures in dense electron-positron plasma

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