skip to main content

Title: Magnetohydrodynamic waves with relativistic electrons and positrons in degenerate spin-1/2 astrophysical plasmas

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.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [3] ;  [5]
  1. Department of Physics, Abdul Wali Khan University, Mardan 23200 (Pakistan)
  2. (Pakistan)
  3. (NCP) at QAU Campus, Shahdra Valley Road, Islamabad 44000 (Pakistan)
  4. National Center for Physics (NCP) at QAU Campus, Shahdra Valley Road, Islamabad 44000 (Pakistan)
  5. Department of Physics, University of Peshawar, Peshawar 25000 (Pakistan)
Publication Date:
OSTI Identifier:
22489819
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 11; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 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