Nonlinear excitations in electron-positron-ion plasmas in accretion disks of active galactic nuclei
Data(s) |
01/10/2007
|
---|---|
Resumo |
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 |
Formato |
application/pdf |
Identificador |
http://dx.doi.org/10.1063/1.2795127 http://pure.qub.ac.uk/ws/files/474242/Kourakis%20REF%204.pdf http://www.scopus.com/inward/record.url?scp=36049038331&partnerID=8YFLogxK |
Idioma(s) |
eng |
Direitos |
info:eu-repo/semantics/restrictedAccess |
Fonte |
Moslem , W M , Kourakis , I , Schlickeiser , R & Shukla , P K 2007 , ' Nonlinear excitations in electron-positron-ion plasmas in accretion disks of active galactic nuclei ' Physics of Plasmas , vol 14 (10) , no. 10 , 102901 , pp. 102901/1-102901/10 . DOI: 10.1063/1.2795127 |
Palavras-Chave | #/dk/atira/pure/subjectarea/asjc/3100 #Physics and Astronomy(all) #/dk/atira/pure/subjectarea/asjc/3100/3104 #Condensed Matter Physics |
Tipo |
article |