### Abstract

Language | English |
---|---|

Pages | 102901 -102911 |

Journal | Physics of Plasmas |

Volume | 14 |

Issue number | 10 |

DOIs | |

Publication status | Published - Oct 2007 |

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### Keywords

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

### Cite this

*Physics of Plasmas*,

*14*(10), 102901 -102911. https://doi.org/10.1063/1.2795127

}

*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.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Nonlinear excitations in electron-positron-ion plasmas in accretion disks of active galactic nuclei

AU - Moslem, W.M.

AU - Kourakis, I.

AU - Shukla, P.K.

AU - Schlickeiser, R.

N1 - Correction to this article published: Physics of Plasmas (2008), 15 (1).

PY - 2007/10

Y1 - 2007/10

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.

AB - 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.

KW - nonlinear excitations

KW - electron-positron-ion plasmas

KW - galactic nuclei

KW - physics

KW - plasmas

UR - http://pop.aip.org/resource/1/phpaen/v14/i10/p102901_s1

UR - http://strathprints.strath.ac.uk/19795/

UR - http://dx.doi.org/10.1063/1.2795127

U2 - 10.1063/1.2795127

DO - 10.1063/1.2795127

M3 - Article

VL - 14

SP - 102901

EP - 102911

JO - Physics of Plasmas

T2 - Physics of Plasmas

JF - Physics of Plasmas

SN - 1070-664X

IS - 10

ER -