Escape of charged particles moving around a weakly magnetized Kerr black hole

Zahrani, Al

doi:10.1103/physrevd.90.044012

Cited by 25 publications

(19 citation statements)

References 33 publications

(47 reference statements)

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Section: Introductionmentioning

confidence: 99%

“…In this work, we will focus on the dynamics of a neutral particle orbiting around a Kerr-Newman black hole, mainly following the strategy developed by [14]. Most of results in [14] for a Kerr black hole will be generalized to a spinning charged black hole. The effects of electromagnetic fields associated with the Kerr-Newman black hole on a neutral particle are solely through the gravitational influence.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Geodesic motion of neutral particles around a Kerr–Newman black hole

Liu¹,

Lee²,

Lin³

2017

Class. Quantum Grav.

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We examine the dynamics of a neutral particle around a Kerr-Newman black hole, and in particular focus on the effects of the charge of the spinning black hole on the motion of the particle.We first consider the innermost stable circular orbits (ISCO) on the equatorial plane. It is found that the presence of the charge of the black hole leads to the effective potential of the particle with stronger repulsive effects as compared with the Kerr black hole. As a result, the radius of ISCO decreases as charge Q of the black hole increases for a fixed value of black hole's angular momentum a. We then consider a kick on the particle from its initial orbit out of the equatorial motion. The perturbed motion of the particle will eventually be bounded, or unbounded so that it escapes to spatial infinity. Even more, the particle will likely be captured by the black hole. Thus we analytically and numerically determine the parameter regions of the corresponding motions, in terms of the initial radius of the orbital motion and the strength of the kick. The comparison will be made with the motion of a neutral particle in the Kerr black hole.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Geodesic motion of neutral particles around a Kerr–Newman black hole

Liu¹,

Lee²,

Lin³

2017

Class. Quantum Grav.

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“…Exit basins (or basins of attraction in the case of dissipative systems) provide a useful way to analyze chaotic conservative dynamical systems. This type of analysis has been applied to various dynamical systems such as the paradigmatic Hénon-Heiles system [16][17][18][19], as well as systems describing black holes [6,8,[20][21][22]]. An exit basin B i , associated with a particular exit E i , is the closure of the set of all initial conditions that escape from the bounded region through exit E i .…”

Section: Basin Plots For a Charged Particle In A Circular Orbitmentioning

confidence: 99%

Chaotic exits from a weakly magnetized Schwarzschild black hole

Bautista,

Vega

2020

Preprint

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A charged particle kicked from an initial circular orbit around a weakly magnetized Schwarzschild black hole undergoes transient chaotic motion before either getting captured by the black hole or escaping upstream or downstream with respect to the direction of the magnetic field. These final states form basins of attraction in the space of initial states. We provide a detailed numerical study of the basin structure of this initial state space. We find it to possess the peculiar Wada property: each of its basin boundaries is shared by all three basins. Using basin entropy as a measure, we show that uncertainty in predicting the final exit state increases with stronger magnetic interaction. We also present an approximate analytic expression of the critical escape energy for a vertically-kicked charged particle, and discuss how this depends on the strength of the magnetic interaction.

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“…Escaping orbits in the vacuum magnetospheres of compact objects have already been investigated in several studies. Previously considered setups include a weakly magnetized Schwarzschild black hole (Frolov & Shoom 2010;Al Zahrani et al 2013), a strongly magnetized Ernst's spacetime (Karas & Vokrouhlický 1992;Huang et al 2015), a spinning black hole with a magnetic test field (Al Zahrani et al 2014;Hussain et al 2014;Shiose et al 2014;Stuchlík & Kološ 2016), and magnetized naked singularities (Babar et al 2016). Most of these studies considered initially bound circular orbits of charged particles destabilized by the kick that was realized as a sudden introduction of the velocity component perpendicular to the orbital plane.…”

Section: Introductionmentioning

confidence: 99%

Near-horizon structure of escape zones of electrically charged particles around weakly magnetized rotating black hole. II. Acceleration and escape in the oblique magnetosphere

Kopáček¹,

Karas²

2020

Preprint

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Strong gravity and magnetic fields are key ingredients that power processes of accretion and ejection near compact objects. While the particular mechanisms that operate here are still discussed, it seems that the presence of an ordered magnetic field is crucial for the acceleration and collimation of relativistic jets of electrically charged particles on superhorizon length scales. In this context, we further study the effect of a large-scale magnetic field on the dynamics of charged particles near a rotating black hole. We consider a scenario in which the initially neutral particles on regular geodesic orbits in the equatorial plane are destabilized by a charging process (e.g., by photoionization). Some charged particles are accelerated out of the equatorial plane, and they follow jetlike trajectories with relativistic velocities. In our previous paper, we investigated this scenario for the case of perfect alignment of the magnetic field with the axis of rotation; i.e., the system was considered axisymmetric. Here we relax this assumption and investigate nonaxisymmetric systems in which the magnetic field is arbitrarily inclined with respect to the black hole spin. We study the system numerically in order to locate the zones of escaping trajectories and compute the maximum (terminal) escape velocity. It appears that breaking the axial symmetry (even by small inclination angles) substantially increases the fraction of escaping orbits and allows the acceleration to ultrarelativistic velocities that were excluded in the axisymmetric setup. The presence of transient chaotic dynamics in the launching region of the relativistic outflow is confirmed with chaotic indicators.

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Escape of charged particles moving around a weakly magnetized Kerr black hole

Cited by 25 publications

References 33 publications

Geodesic motion of neutral particles around a Kerr–Newman black hole

Geodesic motion of neutral particles around a Kerr–Newman black hole

Chaotic exits from a weakly magnetized Schwarzschild black hole

Near-horizon structure of escape zones of electrically charged particles around weakly magnetized rotating black hole. II. Acceleration and escape in the oblique magnetosphere

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