Nonlinear excitations in electron-positron-ion plasmas in accretion disks of active galactic nuclei

W.M. Moslem, I. Kourakis, P.K. Shukla, R. Schlickeiser

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

The propagation of acoustic nonlinear excitations in an electron-positron-ion (e-p-i) plasma composed of warm electrons and positrons, as well as hot ions, has been investigated by adopting a two-dimensional cylindrical geometry. The electrons and positrons are modeled by hydrodynamic fluid equations, while the ions are assumed to follow a temperature-parametrized Boltzmann distribution (the fixed ion model is recovered in the appropriate limit). This situation applies in the accretion disk near a black hole in active galactic nuclei, where the ion temperature may be as high as 3 to 300 times that of the electrons. Using a reductive perturbation technique, a cylindrical Kadomtsev-Petviashvili equation is derived and its exact soliton solutions are presented. Furthermore, real situations in which the strength of the nonlinearity may be weak are considered, so that higher-order nonlinearity plays an important role. Accordingly, an extended cylindrical Kadomtsev-Petviashvili equation is derived, which admits both soliton and double-layer solutions. The characteristics of the nonlinear excitations obtained are investigated in detail.
LanguageEnglish
Pages102901 -102911
JournalPhysics of Plasmas
Volume14
Issue number10
DOIs
Publication statusPublished - Oct 2007

Fingerprint

active galactic nuclei
accretion disks
positrons
excitation
ions
electrons
solitary waves
nonlinearity
Boltzmann distribution
ion temperature
hydrodynamics
perturbation
propagation
acoustics
fluids
geometry
temperature

Keywords

  • nonlinear excitations
  • electron-positron-ion plasmas
  • galactic nuclei
  • physics
  • plasmas

Cite this

Moslem, W.M. ; Kourakis, I. ; Shukla, P.K. ; Schlickeiser, R. / Nonlinear excitations in electron-positron-ion plasmas in accretion disks of active galactic nuclei. In: Physics of Plasmas. 2007 ; Vol. 14, No. 10. pp. 102901 -102911.
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abstract = "The propagation of acoustic nonlinear excitations in an electron-positron-ion (e-p-i) plasma composed of warm electrons and positrons, as well as hot ions, has been investigated by adopting a two-dimensional cylindrical geometry. The electrons and positrons are modeled by hydrodynamic fluid equations, while the ions are assumed to follow a temperature-parametrized Boltzmann distribution (the fixed ion model is recovered in the appropriate limit). This situation applies in the accretion disk near a black hole in active galactic nuclei, where the ion temperature may be as high as 3 to 300 times that of the electrons. Using a reductive perturbation technique, a cylindrical Kadomtsev-Petviashvili equation is derived and its exact soliton solutions are presented. Furthermore, real situations in which the strength of the nonlinearity may be weak are considered, so that higher-order nonlinearity plays an important role. Accordingly, an extended cylindrical Kadomtsev-Petviashvili equation is derived, which admits both soliton and double-layer solutions. The characteristics of the nonlinear excitations obtained are investigated in detail.",
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Moslem, WM, Kourakis, I, Shukla, PK & Schlickeiser, R 2007, 'Nonlinear excitations in electron-positron-ion plasmas in accretion disks of active galactic nuclei' Physics of Plasmas, vol. 14, no. 10, pp. 102901 -102911. https://doi.org/10.1063/1.2795127

Nonlinear excitations in electron-positron-ion plasmas in accretion disks of active galactic nuclei. / Moslem, W.M.; Kourakis, I.; Shukla, P.K.; Schlickeiser, R.

In: Physics of Plasmas, Vol. 14, No. 10, 10.2007, p. 102901 -102911.

Research output: Contribution to journalArticle

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AU - Moslem, W.M.

AU - Kourakis, I.

AU - Shukla, P.K.

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N2 - The propagation of acoustic nonlinear excitations in an electron-positron-ion (e-p-i) plasma composed of warm electrons and positrons, as well as hot ions, has been investigated by adopting a two-dimensional cylindrical geometry. The electrons and positrons are modeled by hydrodynamic fluid equations, while the ions are assumed to follow a temperature-parametrized Boltzmann distribution (the fixed ion model is recovered in the appropriate limit). This situation applies in the accretion disk near a black hole in active galactic nuclei, where the ion temperature may be as high as 3 to 300 times that of the electrons. Using a reductive perturbation technique, a cylindrical Kadomtsev-Petviashvili equation is derived and its exact soliton solutions are presented. Furthermore, real situations in which the strength of the nonlinearity may be weak are considered, so that higher-order nonlinearity plays an important role. Accordingly, an extended cylindrical Kadomtsev-Petviashvili equation is derived, which admits both soliton and double-layer solutions. The characteristics of the nonlinear excitations obtained are investigated in detail.

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