Particles with magnetic dipole moment orbiting magnetized Schwarzschild black holes: Applications to orbits of hot-spots around Sgr A*

Rayimbaev, Javlon; Ahmedov, Bobomurat; Stuchlik, Zdenek

doi:10.1016/j.dark.2024.101516

Physics of the Dark Universe

2024

DOI: 10.1016/j.dark.2024.101516

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Particles with magnetic dipole moment orbiting magnetized Schwarzschild black holes: Applications to orbits of hot-spots around Sgr A*

Javlon Rayimbaev,

Bobomurat Ahmedov,

Zdenek Stuchlik

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Cited by 3 publications

References 42 publications

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QPOs and circular orbits around black holes in Chaplygin-like cold dark matter

Rahmatov,

Zahid,

Rayimbaev

et al. 2024

Chinese Journal of Physics

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QPOs and circular orbits around black holes in Chaplygin-like cold dark matter

Rahmatov,

Zahid,

Rayimbaev

et al. 2024

Chinese Journal of Physics

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Electric Penrose, circular orbits and collisions of charged particles near charged black holes in Kalb–Ramond gravity

Zahid,

Rayimbaev,

Kurbonov

et al. 2024

Eur. Phys. J. C

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General relativity (GR) is a well-tested theory of gravity in strong and weak field regimes. Many modifications to this theory were obtained, including different scalar, vector, and tensor fields to the GR with non-minimal coupling to gravity. Kalb–Ramond (KR) gravity is also a modified theory formulated in the presence of a bosonic field. One astrophysical way to test gravity is by studying the motion of test particles in the spacetime of black holes (BH). In this work, we study the circular motion of charged particles and explore energetic processes around charged BHs in KR theory. First, we investigated the event horizon radius and analyzed horizon-no horizon regions in the BH charge and KR parameter space. Considering the Coulomb interaction, we derive and analyze the effective potential for charged particles around a charged KR BH. We investigate charged particles’ angular momentum and energy corresponding to circular orbits. We also investigate how the KR non-minimal coupling parameter affects the radius of the innermost stable circular orbits, the corresponding energy, and the angular momentum. We also investigated the electric Penrose process and charged-particle collisions near the KR BH. The presence of the nonzero KR parameter results in a decrease in the energy efficiency of the Penrose process. Also obtained is that the KR parameter’s positive (negative) values cause a decrease (increase) in the center of mass energy of colliding particles near the BH horizon.

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Weak field deflection angle and analytical parameter estimation of the Lorentz-violating Bumblebee parameter through the black hole shadow using EHT data

Lambiase,

Pantig,

Övgün

2024

EPL

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We explored how the Lorentz symmetry breaking parameter $\ell$ affects the Reissner-Nordst"{o}m BH solution in the context of weak field deflection angle, and the black hole shadow. We aim to derive the general expression for the weak deflection angle using the non-asymptotic version of the Gauss-Bonnet theorem, and we presented a way to simplify the calculations under the assumption that the distance of the source and the receiver are the same. \textcolor{blue}{Through the Solar System test, $\ell$ is constrained from around $-10^{-9}$ orders of magnitude to $0$, implying challenging detection of $\ell$ through the deflection of light rays from the Sun.} We also studied the black hole shadow in an analytic way, where we applied the EHT results under the far approximation in obtaining an estimate expression for $\ell$. Using the realistic values of the black hole mass and observer distance for Sgr. A* and M87*, it was shown that $M/r_{\rm o} \neq 1$ is satisfied, implying the relevance and potential promise of the spontaneous Lorentz symmetry breaking parameter's role on the shadow radius uncertainties as measured by the EHT. We find constraints for $\ell$ to be negatively valued, where the upper and lower bounds are $\sim -1.94$ and $\sim -2.04$, respectively.

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Particles with magnetic dipole moment orbiting magnetized Schwarzschild black holes: Applications to orbits of hot-spots around Sgr A*

Cited by 3 publications

References 42 publications

QPOs and circular orbits around black holes in Chaplygin-like cold dark matter

QPOs and circular orbits around black holes in Chaplygin-like cold dark matter

Electric Penrose, circular orbits and collisions of charged particles near charged black holes in Kalb–Ramond gravity

Weak field deflection angle and analytical parameter estimation of the Lorentz-violating Bumblebee parameter through the black hole shadow using EHT data

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