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Neutral test particles around a Schwarzschild black hole immersed in an external uniform magnetic field have no interactions of electromagnetic forces, but their motions can be chaotic. This chaotic behavior is induced owing to the…

General Relativity and Quantum Cosmology · Physics 2018-03-07 Dan Li , Xin Wu

The Gibbons-Maeda-Garfinkle-Horowitz-Strominger (GMGHS) dilatonic black hole, a key solution in low-energy string theory, exhibits previously unexplored chaotic dynamics for charged test particles under electromagnetic influence. While…

High Energy Physics - Theory · Physics 2025-07-28 Zhen-Meng Xu , Da-Zhu Ma , Kai Li

Dynamics of charged particles in the vicinity of a rotating black hole embedded in the external large-scale magnetic field is numerically investigated. In particular, we consider a non-axisymmetric model in which the asymptotically uniform…

High Energy Astrophysical Phenomena · Physics 2015-05-20 Ondřej Kopáček , Vladimír Karas

We study the dynamics of spinning charged test particles orbiting a Schwarzschild black hole immersed in a test uniform magnetic field. This setup provides a simple but physically relevant framework for modeling particle motion in…

General Relativity and Quantum Cosmology · Physics 2026-05-05 Misbah Shahzadi , Martin Kolos , Ondrej Zelenka , Georgios Lukes-Gerakopoulos

We investigate the epicyclic motion of charged test particles and the associated quasi-periodic oscillations (QPOs) around a weakly magnetized black hole surrounded by quintessence within the framework of Einstein-ModMax theory. We analyze…

General Relativity and Quantum Cosmology · Physics 2026-01-07 Hamza Rehman , Sanjar Shaymatov , Tao Zhu

Theories of non-linear electrodynamics inherently describe deviations from Maxwell theory in the strong field regime. Among these, ModMax electrodynamics stands out as a unique one-parameter generalization of Maxwell theory that preserves…

General Relativity and Quantum Cosmology · Physics 2024-10-10 Haryanto M. Siahaan

We consider the motion of test particles around a $Reissner-Nordstr\"{o}m$ black hole immersed into a strong external magnetic field modifying the spacetime structure. When the particles are neutral, their dynamics are nonintegrable because…

General Relativity and Quantum Cosmology · Physics 2023-05-05 Daqi Yang , Wenfang Liu , Xin Wu

Accretion onto black holes and compact stars brings material in a zone of strong gravitational and electromagnetic fields. We study dynamical properties of motion of electrically charged particles forming a highly diluted medium (a corona)…

High Energy Astrophysical Phenomena · Physics 2010-11-12 Ondřej Kopáček , Vladimír Karas , Jiří Kovář , Zdeněk Stuchlík

Cosmic black holes can act as agents of particle acceleration. We study properties of a system consisting of a rotating black hole immersed in a large-scale organized magnetic field. Electrically charged particles in the immediate…

High Energy Astrophysical Phenomena · Physics 2011-10-21 Ondřej Kopáček

The observational data from some black hole candidates suggest the importance of electromagnetic fields in the vicinity of a black hole. Highly magnetized disk accretion may play an importance rule, and large scale magnetic field may be…

Astrophysics · Physics 2011-02-11 Masaaki Takahashi , Hiroko Koyama

To test the role of large-scale magnetic fields in accretion processes, we study dynamics of charged test particles in vicinity of a black hole immersed into an asymptotically uniform magnetic field. Using the Hamiltonian formalism of…

General Relativity and Quantum Cosmology · Physics 2016-02-17 Zdeněk Stuchlík , Martin Kološ

In this work, we study the motion of a magnetized particle orbiting a static and spherically symmetric black hole immersed in an external asymptotically uniform magnetic field in Einstein-dilaton-Gauss-Bonnet gravity. Similar to the…

General Relativity and Quantum Cosmology · Physics 2025-07-23 Romel M. Vargas , M. A. Cuyubamba

The dynamics of charged particles around magnetized black holes provide valuable insights into astrophysical processes near compact objects. In this work, we investigate the bound and unbound trajectories of charged particles in the…

General Relativity and Quantum Cosmology · Physics 2026-02-12 Uktamjon Uktamov , Mohsen Fathi , Javlon Rayimbaev

Investigations of electromagnetic interactions between test-charged and magnetized particles are important in the dynamics of the particles in strong gravitational fields around black holes. Here, we study the dynamics of a particle having…

General Relativity and Quantum Cosmology · Physics 2023-10-13 Sardor Murodov , Javlon Rayimbaev , Bobomurat Ahmedov , Abdullo Hakimov

We investigate the particle motion around a Schwarzschild black hole immersed in a swirling Bertotti-Robinson-Bonnor-Melvin background. This spacetime provides a physically well-motivated framework for studying how the two different…

General Relativity and Quantum Cosmology · Physics 2026-05-26 Wenbin Li , Yu-Qi Lei , Xian-Hui Ge

We study behaviour of ionized region of a Keplerian disk orbiting a Schwarzschild black hole immersed in an asymptotically uniform magnetic field. In dependence on the magnetic parameter ${\cal B}$, and inclination angle $\theta$ of the…

General Relativity and Quantum Cosmology · Physics 2019-06-26 Radim Pánis , Martin Kološ , Zdeněk Stuchlík

The Kerr-MOG black hole has recently attracted significant research attention and has been extensively applied in various fields. To accurately characterize the long-term dynamical evolution of charged particles around Kerr-MOG black hole,…

General Relativity and Quantum Cosmology · Physics 2025-07-22 Zhen-Meng Xu , Da-Zhu Ma , Wen-Fu Cao , Kai Li

We study the motion of charged particles with a magnetic dipole moment orbiting a Schwarzschild black hole immersed in an external paraboloidal magnetic field. The interaction between the particle's intrinsic magnetic moment and the black…

General Relativity and Quantum Cosmology · Physics 2026-04-20 Zakaria. Ahal , Hasan El Moumni , Karima Masmar

In this paper, we study charged black hole solutions in 4-dimensional Einstein-Gauss-Bonnet gravity combined with ModMax nonlinear electrodynamics. This is a conformally invariant extension of Maxwell theory that effectively describes…

General Relativity and Quantum Cosmology · Physics 2026-01-07 Bilel Hamil

While the motion of particles near a rotating, electrically-neutral (Kerr), and charged (Kerr--Newman) black hole is always strictly regular, a perturbation in the gravitational or the electromagnetic field generally leads to chaos. The…

High Energy Astrophysical Phenomena · Physics 2014-05-28 O. Kopáček , V. Karas
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