中国物理B ›› 2013, Vol. 22 ›› Issue (3): 35202-035202.doi: 10.1088/1674-1056/22/3/035202

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

Kadomtsev–Petviashvili equation for dust ion-acoustic solitons in pair-ion plasmas

Hafeez Ur-Rehman   

  1. Theoretical Plasma Physics Division, PINSTECH, P.O. Nilore, Islamabad, Pakistan;Department of Physics and Applied Mathematics, PIEAS, P.O. Nilore, Islamabad, Pakistan
  • 收稿日期:2012-07-26 修回日期:2012-09-05 出版日期:2013-02-01 发布日期:2013-02-01

Kadomtsev–Petviashvili equation for dust ion-acoustic solitons in pair-ion plasmas

Hafeez Ur-Rehman   

  1. Theoretical Plasma Physics Division, PINSTECH, P.O. Nilore, Islamabad, Pakistan;Department of Physics and Applied Mathematics, PIEAS, P.O. Nilore, Islamabad, Pakistan
  • Received:2012-07-26 Revised:2012-09-05 Online:2013-02-01 Published:2013-02-01
  • Contact: Hafeez Ur-Rehman E-mail:hafeezr@gmail.com

摘要: Using the reductive perturbation method, we have derived the Kadomtsev-Petviashvili (KP) equation to study the nonlinear properties of electrostatic collisionless dust ion-acoustic solitons in the pair-ion (p-i) plasmas. We have chosen the fluid model for the positive ions, the negative ions, and a fraction of static charged (both positively and negatively) dust particles. Numerical solutions of these dust ion-acoustic solitons are plotted and their characteristics are discussed. It is found that only the amplitudes of the electrostatic dust ion-acoustic solitons vary when the dust is introduced in the pair-ion plasma. It is also noticed that the amplitude and the width of these solitons both vary when the thermal energy of the positive or negative ions is varied. It is shown that potential hump structures are formed when the temperature of the negative ions is higher than that of the positive ions, and potential dip structures are observed when the temperature of the positive ions supersedes that of the negative ions. As the pair-ion plasma mimics the electron-positron plasma, thus our results might be helpful in understanding the nonlinear dust ion acoustic solitary waves in super dense astronomical bodies.

关键词: charged and static dust particles, pair-ion plasma, soliton

Abstract: Using the reductive perturbation method, we have derived the Kadomtsev–Petviashvili (KP) equation to study the nonlinear properties of electrostatic collisionless dust ion-acoustic solitons in the pair-ion (p-i) plasmas. We have chosen the fluid model for the positive ions, the negative ions, and a fraction of static charged (both positively and negatively) dust particles. Numerical solutions of these dust ion-acoustic solitons are plotted and their characteristics are discussed. It is found that only the amplitudes of the electrostatic dust ion-acoustic solitons vary when the dust is introduced in the pair-ion plasma. It is also noticed that the amplitude and the width of these solitons both vary when the thermal energy of the positive or negative ions is varied. It is shown that potential hump structures are formed when the temperature of the negative ions is higher than that of the positive ions, and potential dip structures are observed when the temperature of the positive ions supersedes that of the negative ions. As the pair-ion plasma mimics the electron–positron plasma, thus our results might be helpful in understanding the nonlinear dust ion acoustic solitary waves in super dense astronomical bodies.

Key words: charged and static dust particles, pair-ion plasma, soliton

中图分类号:  (Electrostatic waves and oscillations (e.g., ion-acoustic waves))

  • 52.35.Fp
52.35.Sb (Solitons; BGK modes) 52.27.Lw (Dusty or complex plasmas; plasma crystals)