Dust Alfven ordinary and cusp solitons and modulational instability
in a self-gravitating magneto-radiative plasma |
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Authors: | W Masood H A Shah N L Tsintsadze and M NS Qureshi |
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Institution: | 1.Theoretical Plasma Physics Division, PINSTECH,Islamabad,Pakistan;2.Department of Physics,G.C. University,Lahore,Pakistan;3.Institute of Physics,Georgia,Russia |
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Abstract: | The effective one-fluid adiabatic magnetohydrodynamic (MHD) equations for a
multicomponent plasma comprising of electrons, ions, and dust are used to
investigate the nonlinear coupling of dust Alfven and dust acoustic waves in
the presence of radiation pressure as well as the Jean’s term that arises in
a self-gravitating plasma. In this context, the set of Zakharov equations
are derived. The soliton solutions in the presence of radiation pressure and
Jeans term are separately discussed. It is found that ordinary solitons are
obtained in the absence of Jeans term whereas cusp solitons are found in the
absence of radiation pressure. To the best of our knowledge, cusp solitons
are obtained for the first time for a self-gravitating plasma with Jeans
term for an electromagnetic wave in a dusty plasma. The modulational
instability is also investigated in the presence of radiation pressure and
Jeans term. It is found that the Jeans term drives the system modulationally
unstable provided it dominates the dust acoustic and radiation pressure
terms whereas the radiation pressure enhances the stability of the system.
The relevance of the present investigation in the photodissociation region
that separates the HII region from the dense molecular clouds is also
pointed out. |
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Keywords: | |
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