scholarly journals Isothermal plasma wave properties of the Schwarzschild de-Sitter black hole in a Veselago medium

2012 ◽  
Vol 340 (1) ◽  
pp. 185-198 ◽  
Author(s):  
M. Sharif ◽  
Ifra Noureen
Keyword(s):  
Black Hole ◽  
Plasma Wave ◽  
De Sitter ◽  
Isothermal Plasma ◽  
Veselago Medium ◽  
Wave Properties

scholarly journals Wave properties of isothermal magneto-rotational fluids

2009 ◽  
Vol 87 (8) ◽  
pp. 879-894 ◽  
Author(s):  
M. Sharif ◽  
Umber Sheikh
Keyword(s):  
Black Hole ◽  
Kerr Black Hole ◽  
Production Region ◽  
Complex Wave ◽  
Isothermal Plasma ◽  
Veselago Medium ◽  
General Relativistic ◽  
Phase And Group Velocities ◽  
Wave Properties ◽  
Group Velocities

In this paper, the isothermal plasma-wave properties in the neighborhood of the pair-production region for the Kerr black-hole magnetosphere are discussed. We consider the Fourier-analyzed form of the perturbed general relativistic magnetohydrodynamical equations whose determinant leads to a dispersion relation. For the special scenario, the x-components of the complex wave vectors are calculated numerically. Respective components of the propagation vector, attenuation vector, phase and group velocities are shown in graphs. We have investigated, in particular, the existence of a Veselago medium and wave behavior (modes of waves dispersion).

scholarly journals Wave properties of plasma surrounding the event horizon of a nonrotating black hole

2008 ◽  
Vol 86 (11) ◽  
pp. 1265-1285 ◽  
Author(s):  
M Sharif ◽  
G Mustafa
Keyword(s):  
Black Hole ◽  
Event Horizon ◽  
Schwarzschild Black Hole ◽  
Magnetohydrodynamics Equations ◽  
Normal Dispersion ◽  
Isothermal Plasma ◽  
General Relativistic ◽  
Relativistic Magnetohydrodynamics ◽  
Wave Properties ◽  
Complex Dispersion

We study the wave properties of a cold isothermal plasma in the vicinity of a Schwarzschild black-hole event horizon. The Fourier-analyzed perturbed 3+1 general relativistic magnetohydrodynamics equations are examined such that the complex dispersion relations are obtained for nonrotating, rotating nonmagnetized, and rotating magnetized backgrounds. The propagation and attenuation vectors along with the refractive index are obtained (shown graphically) to study the dispersive properties of the medium near the event horizon. The results show that no information can be obtained from the Schwarzschild magnetosphere. Further, the pressure stops the existence of normal dispersion of waves.PACS Nos.: 95.30.Sf, 95.30.Qd, 04.30.Nk

scholarly journals Hot plasma modes across Reissner–Nördstrom–de Sitter horizon in a Veselago medium

2015 ◽  
Vol 93 (5) ◽  
pp. 565-573
Author(s):  
Ifra Noureen ◽  
Hafiza Rizwana Kausar
Keyword(s):  
Fourier Analysis ◽  
Wave Dispersion ◽  
Plasma Waves ◽  
Perturbation Scheme ◽  
De Sitter ◽  
Hot Plasma ◽  
Veselago Medium ◽  
General Relativistic ◽  
Grmhd Equations ◽  
Wave Properties

We investigate wave attributes of hot plasma around a Reissner–Nördstrom–de Sitter (RN-dS) metric in a Veselago medium. A perturbation scheme is implemented on general relativistic magnetohydrodynamical (GRMHD) equations that are further used for Fourier analysis. The linearly perturbed Fourier-analyzed GRMHD equations depict the dispersion of hot plasma waves. It is found that inclusion of charge in de Sitter space greatly affects the wave dispersion. A comparison of wave properties is presented, and results reassert the presence of the Veselago medium.

scholarly journals Driven black holes: from Kolmogorov scaling to turbulent wakes

2021 ◽  
Vol 2021 (7) ◽  
Author(s):  
Tomas Andrade ◽  
Christiana Pantelidou ◽  
Julian Sonner ◽  
Benjamin Withers
Keyword(s):  
Nonlinear Dynamics ◽  
Black Holes ◽  
General Relativity ◽  
Black Hole ◽  
Strong Field ◽  
De Sitter ◽  
Event Horizons ◽  
Binary Mergers ◽  
Tidal Deformations ◽  
Proof Of Principle

Abstract General relativity governs the nonlinear dynamics of spacetime, including black holes and their event horizons. We demonstrate that forced black hole horizons exhibit statistically steady turbulent spacetime dynamics consistent with Kolmogorov’s theory of 1941. As a proof of principle we focus on black holes in asymptotically anti-de Sitter spacetimes in a large number of dimensions, where greater analytic control is gained. We focus on cases where the effective horizon dynamics is restricted to 2+1 dimensions. We also demonstrate that tidal deformations of the horizon induce turbulent dynamics. When set in motion relative to the horizon a deformation develops a turbulent spacetime wake, indicating that turbulent spacetime dynamics may play a role in binary mergers and other strong-field phenomena.

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