Charged particle motion around a quasi-Kerr compact object immersed in an external magnetic field

Narzilloev, Bakhtiyor; Abdujabbarov, Ahmadjon; Bambi, Cosimo; Ahmedov, Bobomurat

doi:10.1103/physrevd.99.104009

Cited by 41 publications

(21 citation statements)

References 78 publications

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“…The innermost stable circular orbit (ISCO) of test particles in the equatorial plane can be calculated using the following standard conditions obtained from Eq. (48) [48]:…”

Section: Particle Motionmentioning

confidence: 99%

On the properties of a deformed extension of the NUT space-time

et al. 2020

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We consider a class of space-times given by a stationary extension of the Zipoy–Voorhees metric that was found by Halilsoy. We show that the solutions do not describe rotating sources but must be interpreted, similarly to the NUT case, as deformed sources endowed with a gravitomagnetic charge. We show that the Halilsoy family is directly linked to the NUT space-time, which can be obtained in the limit of vanishing deformations. We investigate the motion of test particles and photons in this class of space-times, in particular the innermost stable circular orbits and photon capture radius. Finally we show that this class of solutions possesses a sub-manifold where closed time-like curves are allowed.

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“…The innermost stable circular orbit (ISCO) of test particles in the equatorial plane can be calculated using the following standard conditions obtained from Eq. (48) [48]:…”

Section: Particle Motionmentioning

confidence: 99%

On the properties of a deformed extension of the NUT space-time

et al. 2020

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“…: V,-vol weak lensing near the quasi-Kerr black hole [41]. Recently we have also studied the charged particle motion around a quasi-Kerr compact object in the presence of a magnetic field [42].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of charged particles and magnetic dipoles around magnetized quasi-Schwarzschild black holes

et al. 2021

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In the present paper, we have investigated the motion of charged particles together with magnetic dipoles to determine how well the spacetime deviation parameter $$\epsilon $$ ϵ and external uniform magnetic field can mimic the spin of a rotating Kerr black hole. Investigation of charged particle motion has shown that the deviation parameter $$\epsilon $$ ϵ in the absence of an external magnetic fields can mimic the rotation parameter of the Kerr spacetime up to $$a/M \approx 0.5$$ a / M ≈ 0.5 . The combination of an external magnetic field and deviation parameter can do even a better job mimicking the rotation parameter up to $$a/M\simeq 0.93$$ a / M ≃ 0.93 , which corresponds to the rapidly rotating case. Study of the dynamics of the magnetic dipoles around quasi-Schwarzschild black holes in the external magnetic field has shown that there are degeneracy values of the ISCO radius of test particles at $$\epsilon _{cr}>\epsilon \ge 0.35$$ ϵ cr > ϵ ≥ 0.35 which may lead to two different values of the innermost stable circular orbit (ISCO) radius. When the deviation parameter is in the range of $$\epsilon \in (-1,\ 1)$$ ϵ ∈ ( - 1 , 1 ) , it can mimic the spin of a rotating Kerr black hole in the range $$a/M \in (0.0537, \ 0.3952)$$ a / M ∈ ( 0.0537 , 0.3952 ) for magnetic dipoles with values of the magnetic coupling parameter $$\beta \in [-0.25,\ 0.25]$$ β ∈ [ - 0.25 , 0.25 ] in corotating orbits.

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“…The Penrose process [47], Blandford-Znajeck mechanism [48], Magnetic Penrose process [49][50][51][52] and particle acceleration mechanism (BSW) [53] are several of them which can be used for modelling the high energetic processes of active galactic nuclei and other X-ray sources. The energetic processes around black holes in different scenarios in alternative and modified theories of gravity have been extensively studied e.g., in [27,29,[31][32][33][34]36,[54][55][56].…”

Section: Introductionmentioning

confidence: 99%

Magnetized Particle Motion around Black Holes in Conformal Gravity: Can Magnetic Interaction Mimic Spin of Black Holes?

et al. 2020

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Magnetized particle motion around black holes in conformal gravity immersed in asymptotically uniform magnetic field has been studied. We have also analyzed the behavior of magnetic fields near the horizon of the black hole in conformal gravity and shown that with the increase of conformal parameters L and N the value of angular component of magnetic field at the stellar surface decreases. The maximum value of the effective potential corresponding to circular motion of the magnetized particle increases with the increase of conformal parameters. It is shown that in all cases of neutral, charged and magnetized particle collisions in the black hole environment the center-of-mass energy decreases with the increase of conformal parameters L and N. In the case of the magnetized and negatively charged particle collisions, the innermost collision point with the maximum center-of-mass energy comes closer to the central object due to the effects of the parameters of the conformal gravity. We have applied the results to the real astrophysical scenario when a pulsar treated as a magnetized particle is orbiting the super massive black hole (SMBH) Sgr A* in the center of our galaxy in order to obtain the estimation of magnetized compact object’s orbital parameter. The possible detection of pulsar in Sgr A* close environment can provide constraints on black hole parameters. Here we have shown that there is degeneracy between spin of SMBH and ambient magnetic field and consequently the interaction of magnetic field ∼ 10 2 Gauss with magnetic moment of magnetized neutron star can in principle mimic spin of Kerr black holes up to 0.6 .

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Charged particle motion around a quasi-Kerr compact object immersed in an external magnetic field

Cited by 41 publications

References 78 publications

On the properties of a deformed extension of the NUT space-time

On the properties of a deformed extension of the NUT space-time

Dynamics of charged particles and magnetic dipoles around magnetized quasi-Schwarzschild black holes

Magnetized Particle Motion around Black Holes in Conformal Gravity: Can Magnetic Interaction Mimic Spin of Black Holes?

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