Destroying a near-extremal Kerr black hole with a charged particle: Can a test magnetic field serve as a cosmic censor?

Abstract

We investigate effect of a test magnetic field on the process of destroying near-extremal Kerr black hole with a charged test particle. It has been shown that it would be possible to throw a charged test particle into the near extremal rotating black hole and make it go past the extremality i.e. turn Kerr black hole into the Kerr-Newmann naked singularity. Typically in an astrophysical scenario black holes are believed to be surrounded by a magnetic field. Magnetic field although small, affects motion of charged particles drastically due to the large Lorentz force, as the electromagnetic force is much stronger that the gravity. Thus a test magnetic field can affect the process of destroying black holes and restore the cosmic censorship in the astrophysical context. We show that a test magnetic field would act as a cosmic censor beyond a certain threshold value. We try to gauge the magnitude of the magnetic field by comparing its energy density with that of the change in the curvature induced by the test particle. We find that the magnetic field required in only as strong as or slightly stronger as compared to the value for which its effect of the background geometry is comparable to the tiny backreaction as that of the test particle. In such a case however one has to take take into account effect of the magnetic field on the background geometry, which is difficult to implement in the absence of any exact near-extremal rotating magnetized black hole solutions. We argue that magnetic field would still act as a cosmic censor.

11 pages, 12 figures

References in corpus (6)

• Test bodies and naked singularities: is the self-force the cosmic censor?
• Motion of charged particles near weakly magnetized Schwarzschild black hole
• Destroying a near-extremal Kerr-Newman black hole
• Gravitational perturbation of the BTZ black hole induced by test particles and weak cosmic censorship in AdS spacetime
• Particle Motion and Electromagnetic Fields of Rotating Compact Gravitating Objects with Gravitomagnetic Charge
• Magnetic layers and neutral points near rotating black hole

Cited by in corpus (21)

• Dynamics of test particles around a Bardeen black hole surrounded by perfect fluid dark matter
• Dynamics of particles and epicyclic motions around Schwarzschild-de-Sitter black hole in perfect fluid dark matter
• Charged black hole in $4D$ Einstein-Gauss-Bonnet gravity: Particle motion, plasma effect on weak gravitational lensing and centre-of-mass energy
• Charged particle and epicyclic motions around $4D$ Einstein-Gauss-Bonnet black hole immersed in an external magnetic field
• Can the dynamics of test particles around charged stringy black holes mimic the spin of Kerr black holes?
• Construction of Explicit Symplectic Integrators in General Relativity. I. Schwarzschild Black Holes
• Test particle motion around black hole in Einstein-Maxwell-scalar theory
• Can test fields destroy the event horizon in the Kerr-Taub-NUT spacetime?
• Motion of charged and spinning particle influenced by dark matter field surrounding a charged dyonic black hole
• Motion of Particles and Gravitational Lensing Around (2+1)-dimensional BTZ black holes in Gauss-Bonnet Gravity
• Constraints on the magnetized Ernst black hole spacetime through quasiperiodic oscillations
• Dynamics of charged particles and magnetic dipoles around magnetized quasi-Schwarzschild black holes
• Kerr-Newman black holes can be generically overspun
• Charged particle motions near non-Schwarzschild black holes with external magnetic fields in modified theories of gravity
• Particle dynamics and the accretion disk around a Self-dual Black Hole immersed in a magnetic field in Loop Quantum Gravity
• Extending the weak cosmic censorship conjecture to the charged Buchdahl star by employing the gedanken experiments
• Overcharging process around a magnetized black hole: Can the backreaction effect of magnetic field restore cosmic censorship conjecture?
• Testing the weak cosmic censorship conjecture for extremal magnetized Kerr-Newman black holes
• Effects of coupling constants on chaos of charged particles in the $Einstein-\AE$ ther theory
• The Gravity of Classical Fields: And Its Effect on the Dynamics of Gravitational Systems
• Charged particle motion around a magnetized Reissner-Nordström black hole