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Author Maroof, R. ♦ Ali, S. ♦ Mushtaq, A. ♦ Qamar, A.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PLASMA PHYSICS AND FUSION TECHNOLOGY ♦ ALFVEN WAVES ♦ ASTROPHYSICS ♦ DISPERSION RELATIONS ♦ ELECTRONS ♦ INTERACTIONS ♦ IONS ♦ MAGNETIZATION ♦ MAGNETOHYDRODYNAMICS ♦ NEUTRON STARS ♦ POSITRONS ♦ QUANTUM MECHANICS ♦ RELATIVISTIC PLASMA ♦ RELATIVISTIC RANGE ♦ SPIN ♦ WHITE DWARF STARS
Abstract Linear properties of high and low frequency waves are studied in an electron-positron-ion (e-p-i) dense plasma with spin and relativity effects. In a low frequency regime, the magnetohydrodynamic (MHD) waves, namely, the magnetoacoustic and Alfven waves are presented in a magnetized plasma, in which the inertial ions are taken as spinless and non-degenerate, whereas the electrons and positrons are treated quantum mechanically due to their smaller mass. Quantum corrections associated with the spin magnetization and density correlations for electrons and positrons are re-considered and a generalized dispersion relation for the low frequency MHD waves is derived to account for relativistic degeneracy effects. On the basis of angles of propagation, the dispersion relations of different modes are discussed analytically in a degenerate relativistic plasma. Numerical results reveal that electron and positron relativistic degeneracy effects significantly modify the dispersive properties of MHD waves. Our present analysis should be useful for understanding the collective interactions in dense astrophysical compact objects, like, the white dwarfs and in atmosphere of neutron stars.
ISSN 1070664X
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-11-15
Publisher Place United States
Journal Physics of Plasmas
Volume Number 22
Issue Number 11


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