Magnetized particle motion around magnetized Schwarzschild-MOG black hole

Haydarov, Kamoliddin; Rayimbaev, Javlon; Abdujabbarov, Ahmadjon; Palvanov, S. R.; Begmatova, Dilfuza

doi:10.1140/epjc/s10052-020-7992-9

“…Collisions of such particles near rotating black holes in quintessence have been investigated in [82]. We also refer the reader to the works where acceleration of magnetic dipole near gravitational compact objects has been studied in the presence of external magnetic field [83][84][85][86][87][88].…”

Section: Introductionmentioning

confidence: 99%

Dynamics of test particles around a Bardeen black hole surrounded by perfect fluid dark matter

Narzilloev

¹

,

Rayimbaev

²

,

Shaymatov

³

et al. 2020

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We study the dynamics of (i) neutral test particles, (ii) magnetically charged test particles, and (iii) test magnetic dipole around a regular Bardeen black hole surrounded by perfect fluid dark matter (PFDM). It has been shown how the magnetic charge of the black hole and the parameter of the surrounding PFDM can influence the innermost stable circular orbit (ISCO) radius of a test particle. We have found that the ISCO radius is strongly affected as a consequence of the combined effect of the magnetic charge parameter and the perfect fluid dark matter. The black hole magnetic charge parameter g and the combined effect of perfect fluid dark matter can mimic the black hole rotation parameter up to a/M ≈ 0.9. It has been observed that the ISCO for magnetic dipole disappears at the values exceeding the calculated upper value for the magnetic interaction parameter β. The upper limit decreases with the increase of both the dark matter and magnetic charge parameters. Finally, as an astrophysical application, we have analyzed degeneracy effects of spin of Kerr black holes and magnetic charge of regular Bardeen black holes for the different values of the dark matter parameter providing exactly the same value for ISCO radius of a magnetic dipole with the same value of the parameter β = 10.2 of the magnetar called PSR J1745-2900 orbiting around supermassive black hole Sagittarius A*. It has been observed that the magnetic charge of the pure regular Bardeen black hole can mimic the spin of a Kerr black hole up to a/M 0.8085, while upper limit for the magnetic charge which may provide ISCO for the magnetic dipole is gupper 0.65M . In the presence of PFDM with the parameter α = 0.01(0.05), the upper limit for the magnetic charge decreases and equals to gupper 0.62M (0.548M ) and consequently mimicker value for the spin parameter of black hole lies in the range of a/M ∈ (0.0106 ÷ 0.8231) ( a/M ∈ (0.0816 ÷ 0.8595)). We also show that the same values of the spin of Kerr black hole and the magnetic charge of regular Bardeen black hole surrounded by PFDM provide the same values for the ISCO radius of the chosen magnetar.

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“…Testing general relativity and alternative theories of gravity through gravitational lensing and motion of test particles under the various conditions is important to distinguish the central black hole parameters from the ones of alternate gravity theories, since their effects are similar or exactly the same at some range of values of the parameters of theories of gravity. For example in our previous work we have shown how the effects of the MOG field parameters [43], the conformal parameters [44,45], the coupling parameter of the Einstein-Gauss-Bonnet theory [46], the electric charge of a black hole in Einstein-Maxwell theory [47], the stringy charge [45], perfect fluid dark matter [48] and quantum gravity [49] can mimic the spin of a rotating Kerr black hole. On the other hand, by now, in spite of the attempts to detect neutron stars as recycled radio pulsars near the supermassive black hole Sagittarius A* in the center of the Milky Way by the GRAV-ITY collaboration, we do not have any astrophysical observations of them.…”

Section: Introductionmentioning

confidence: 99%

“…[56][57][58][59][60]124,125]. The magnetic dipole motion around a black hole in the presence of an asymptotically uniform magnetic field has been studied in [126,127] with further development to the case of modified gravity theories in [43][44][45]49,[128][129][130][131][132][133][134][135].…”

Section: Introductionmentioning

confidence: 99%

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

Narzilloev

¹

,

Rayimbaev

²

,

Abdujabbarov

³

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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“…This study has been extended to the rotating Kerr BH case in [73]. The magnetized particle dynamics around BH in alternate theories of gravity have been studied by several authors [50,[74][75][76][77][78][79][80][81].…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the stability of the magnetized particle orbits depends on the parameters of the considered theory of gravity. However, the dynamics of the test of magnetized particles around compact objects leading to the degeneracy between the parameters of alternate theories of gravity and spin parameter of Kerr BH through the innermost stable circular orbit (ISCO) measurements are studied in [79][80][81]92,93].…”

Section: Introductionmentioning

confidence: 99%

Magnetized Particle Motion in γ-Spacetime in a Magnetic Field

Abdujabbarov

¹

,

Rayimbaev

²

,

Atamurotov

³

et al. 2020

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In the present work we explored the dynamics of magnetized particles around the compact object in γ-spacetime in the presence of an external asymptotically-uniform magnetic field. The analysis of the circular orbits of magnetized particles around the compact object in the spacetime of a γ-object immersed in the external magnetic field has shown that the area of stable circular orbits of magnetized particles increases with the increase of γ-parameter. We have also investigated the acceleration of the magnetized particles near the γ-object and shown that the center-of-mass energy of colliding magnetized particles increases with the increase of γ-parameter. Finally, we have applied the obtained results to the astrophysical scenario and shown that the values of γ-parameter in the range of γ∈(0.5,1) can mimic the spin of Kerr black hole up to a≃0.85, while the magnetic interaction can mimic the γ-parameter at γ∈(0.8,1) and spin of a Kerr black hole up to a≃0.3.

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Magnetized particle motion around magnetized Schwarzschild-MOG black hole

Cited by 40 publications

References 87 publications

Dynamics of test particles around a Bardeen black hole surrounded by perfect fluid dark matter

Dynamics of test particles around a Bardeen black hole surrounded by perfect fluid dark matter

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

Magnetized Particle Motion in γ-Spacetime in a Magnetic Field

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