ION ACOUSTIC SOLITONS IN DENSE MAGNETIZED PLASMAS WITH NONRELATIVISTIC AND ULTRARELATIVISTIC DEGENERATE ELECTRONS AND POSITRONS

The propagation of electrostatic waves in a dense magnetized electron-positron-ion (EPI) plasma with nonrelativistic and ultrarelativistic degenerate electrons and positrons is investigated. The linear dispersion relation is obtained for slow and fast electrostatic waves in the EPI plasma. The limit...

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Bibliographic Details
Published in:The Astrophysical journal 2014-09, Vol.793 (1), p.1-12
Main Authors: Sadiq, Safeer, Mahmood, S, Haque, Q, Ali, Munazza Zulfiqar
Format: Article
Language:English
Subjects:
ABUNDANCE
Acoustics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
COMPACTS
CONCENTRATION RATIO
CYCLOTRON RADIATION
DISPERSION RELATIONS
Dispersions
ELECTRONS
Electrostatic waves
ION ACOUSTIC WAVES
IONS
MAGNETIC FIELDS
MASS
NONLINEAR PROBLEMS
PERTURBATION THEORY
Plasmas
POSITRONS
Pulsar magnetospheres
PULSARS
RELATIVISTIC RANGE
SOLITONS
STARS
TWO-DIMENSIONAL CALCULATIONS
Wave propagation
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Summary:The propagation of electrostatic waves in a dense magnetized electron-positron-ion (EPI) plasma with nonrelativistic and ultrarelativistic degenerate electrons and positrons is investigated. The linear dispersion relation is obtained for slow and fast electrostatic waves in the EPI plasma. The limiting cases for ion acoustic wave (slow) and ion cyclotron wave (fast) are also discussed. Using the reductive perturbation method, two-dimensional propagation of ion acoustic solitons is found for both the nonrelativistic and ultrarelativistic degenerate electrons and positrons. The effects of positron concentration, magnetic field, and mass of ions on ion acoustic solitons are shown in numerical plots. The proper form of Fermi temperature for nonrelativistic and ultrarelativistic degenerate electrons and positrons is employed, which has not been used in earlier published work. The present investigation is useful for the understanding of linear and nonlinear electrostatic wave propagation in the dense magnetized EPI plasma of compact stars. For illustration purposes, we have applied our results to a pulsar magnetosphere.
ISSN:1538-4357
0004-637X
1538-4357
DOI:10.1088/0004-637X/793/1/27