The Exchange-Correlation Field Effect over the Magnetoacoustic-Gravitational Instability in Plasmas

2017 ◽  
Vol 72 (10) ◽  
pp. 915-921 ◽  
Author(s):  
A. Rasheed ◽  
M. Jamil ◽  
Young-Dae Jung ◽  
A. Sahar ◽  
M. Asif
Keyword(s):  
Thermal Effects ◽  
Analytical Study ◽  
Significant Contribution ◽  
Gravitational Instability ◽  
Threshold Value ◽  
Electron Exchange ◽  
Recoil Effect ◽  
Exchange Correlation ◽  
Correlation Potential ◽  
Jeans Instability

AbstractJeans instability with magnetosonic perturbations is discussed in quantum dusty magnetoplasmas. The quantum and smaller thermal effects are associated only with electrons. The quantum characteristics include exchange-correlation potential, recoil effect, and Fermi degenerate pressure. The multifluid model of plasmas is used for the analytical study of this problem. The significant contribution of electron exchange is noticed on the threshold value of wave vector and Jeans instability. The presence of electron exchange and correlation effects reduce the time to stabilise the phenomenon of self-gravitational collapse of massive species. The results of Jeans instability by magnetosonic perturbations at quantum scale help to disclose the details of the self-gravitating dusty magnetoplasma systems.

Landau Quantised Modification of Rayleigh–Taylor Instability in Dense Plasmas

2020 ◽  
Vol 75 (2) ◽  
pp. 113-118 ◽  
Author(s):  
M. Shahid ◽  
A. Rasheed ◽  
Misbah Kanwal ◽  
M. Jamil
Keyword(s):  
Magnetic Field ◽  
Gravitational Instability ◽  
Taylor Instability ◽  
Dense Plasmas ◽  
Exchange Correlation ◽  
Quantum Hydrodynamic Model ◽  
Exchange Correlation Potential ◽  
Correlation Potential ◽  
Rayleigh Taylor Instability ◽  
Quantum Hydrodynamic

AbstractEffects of Landau quantisation and exchange-correlation potential on Rayleigh–Taylor instability (RTI)/gravitational instability are investigated in inhomogeneous dense plasmas. Quantum hydrodynamic model is used for the electrons, while the ions are assumed to be cold and classical. RTI is modified with the inclusion of Landau quantisation related to plasma density, ambient magnetic field, exchange speed, and modified Fermi speed. Owing to the exchange-correlation effects, gravitational instability increases, whereas the Landau quantisation effects contribute in the opposite way for quantisation factor η < 1. Since the exchange-correlation potential is a function of density, by controlling the number density and magnetic field one can control RTI.

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