The Shell of Incoherent Charged Matter Falling onto a Charged Rotating Black Hole

Stuchlík, Zdeněk; Bičák, Jiřı́; Bálek, V.

doi:10.1023/a:1018863304224

Cited by 31 publications

(36 citation statements)

References 7 publications

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“…Moreover, it can be easily demonstrated that such ultra-high energy processes can appear at r = 1 and arbitrary latitude θ due to head-on collision of particles falling from rest at infinity with zero angular momentum [48,49] that can collide with those that inverted their motion near the ring singularity due to the gravitational repulsion of the field of Kerr superspinars [6].…”

Section: Near-extreme Kerr Superspinars As Sources Of Ultra-high Enermentioning

confidence: 99%

Evolution of Kerr superspinars due to accretion counterrotating thin discs

Stuchlík

Hledík

Truparova

2011

Class. Quantum Grav.

106

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String theory predicts the existence of extremely compact objects spinning faster than Kerr black holes. The spacetime exterior to such superspinars is described by Kerr naked singularity geometry breaking the black-hole limit on the internal angular momentum. We demonstrate that the conversion of Kerr superspinars into a near-extreme black hole due to an accretion counterrotating Keplerian disc is much more effective in comparison with the case of a corotating one since both the accreted rest mass necessary for conversion and the evolution time of conversion are by orders smaller for counterrotating discs. The conversion time of Kerr superspinars is given for several accretion regimes, and it is shown that the self-regulated accretion flow implies fastest evolution to the black-hole state. In the final stages of the conversion, Kerr superspinars can serve as very efficient particle accelerators in the region where the black-hole horizon forms.

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Section: Near-extreme Kerr Superspinars As Sources Of Ultra-high Enermentioning

confidence: 99%

Evolution of Kerr superspinars due to accretion counterrotating thin discs

Stuchlík

Hledík

Truparova

2011

Class. Quantum Grav.

106

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“…having intrinsically coupled gravitational and electromagnetic fields and for strong gravitating objects (black holes and neutron stars) with a test electromagnetic field influenced by gravity (see, e.g., Johnston & Ruffini, 1974;Prasanna & Vishveshwara, 1978;Prasanna, 1980;Calvani et al, 1982;Balek et al, 1989;Bičák et al, 1989;Vokrouhlický & Karas, 1991;Stuchlík & Hledík, 1998;Stuchlík et al, 1999;Abdujabbarov & Ahmedov, 2009).…”

Section: Confidential: Not For Distribution Submitted To Iop Publishmentioning

confidence: 99%

On magnetic-field-induced non-geodesic corrections to relativistic orbital and epicyclic frequencies

Bakala

Šrámková²,

Stuchlík³

et al. 2010

Class. Quantum Grav.

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We discuss non-geodesic corrections to orbital and epicyclic frequencies of charged test particles orbiting a non-rotating neutron star with a dipole magnetic field. Using a fully relativistic approach we consider the influence of both the magnetic attraction and repulsion on the orbital and epicyclic motion. The magnetic repulsion introduces a rather complex and unusual behaviour of the circular orbital motion that is well defined down to the radius where the vertical epicyclic frequency loses its meaning. We demonstrate that for the intensity of the magnetic interaction appropriately restricted, the stable circular orbits extend down to the magnetic innermost stable circular orbit (MISCO) that is located well under the geodetic innermost stable circular orbit (GISCO) and even can reach the region under the photon circular orbit. The lowest stable circular orbit at rMISCOmin = 2.73M, associated with the highest possible orbital frequency , corresponds to the critical value of the particle-specific charge and the neutron star magnetic dipole moment product . For the magnetic attraction acting above the GISCO, the situation is much more simple and we demonstrate that the most significant correction arises for the radial epicyclic frequency and consequently for the location of the MISCO when the strong magnetic attraction pushes its location far behind the location of GISCO. We show that the Lorentz force also naturally violates the equality of the orbital and vertical epicyclic frequencies implied by the spherical symmetry of the background Schwarzschild geometry giving rise to the new effect of nodal precession of the orbital motion plane. Finally, we apply the magnetic attraction corrections on the relativistic precession model of the twin-peak high-frequency quasiperiodic oscillations observed in the galactic low mass x-ray binaries, showing possible high relevance of the modified radial epicyclic frequency.

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“…The equations of motion of the charged test particles are then separable and integrable and the motion has regular character [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Acceleration of the charged particles due to chaotic scattering in the combined black hole gravitational field and asymptotically uniform magnetic field

2016

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To test the role of large-scale magnetic fields in accretion processes, we study the dynamics of the charged test particles in the vicinity of a black hole immersed into an asymptotically uniform magnetic field. Using the Hamiltonian formalism of the charged particle dynamics, we examine chaotic scattering in the effective potential related to the black hole gravitational field combined with the uniform magnetic field. Energy interchange between the translational and oscillatory modes of the charged particle dynamics provides a mechanism for charged particle acceleration along the magnetic field lines. This energy transmutation is an attribute of the chaotic charged particle dynamics in the combined gravitational and magnetic fields only, the black hole rotation is not necessary for such charged particle acceleration. The chaotic scatter can cause a transition to the motion along the magnetic field lines with small radius of the Larmor motion or vanishing Larmor radius, when the speed of the particle translational motion is largest and it can be ultra-relativistic. We discuss the consequences of the model of ionization of test particles forming a neutral accretion disc, or heavy ions following off-equatorial circular orbits, and we explore the fate of heavy charged test particles after ionization where no kick of heavy ions is assumed and only the switch-on effect of the magnetic field is relevant. We demonstrate that acceleration and escape of the ionized particles can be efficient along the Kerr black hole symmetry axis parallel to the magnetic field lines. We show that a strong acceleration of the ionized particles to ultra-relativistic velocities is preferred in the direction close to the magnetic field lines. Therefore, the process of ionization of Keplerian discs around the Kerr black holes can serve as a model of relativistic jets. a

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The Shell of Incoherent Charged Matter Falling onto a Charged Rotating Black Hole

Cited by 31 publications

References 7 publications

Evolution of Kerr superspinars due to accretion counterrotating thin discs

Evolution of Kerr superspinars due to accretion counterrotating thin discs

On magnetic-field-induced non-geodesic corrections to relativistic orbital and epicyclic frequencies

Acceleration of the charged particles due to chaotic scattering in the combined black hole gravitational field and asymptotically uniform magnetic field

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