Abstract
In this work, test particle dynamics around a static regular Bardeen black hole (BH) in Anti-de Sitter spacetime has been studied. It has been shown for neutral test particles that parameters of a regular Bardeen black hole in Anti-de Sitter spacetime can mimic the rotation parameter of the Kerr metric up to the value a≈0.9 providing the same innermost stable circular orbit (ISCO) radius. We have also explored the dynamics of magnetized particles with a magnetic dipole moment around a magnetically charged regular Bardeen black hole in Anti-de Sitter spacetime. As a realistic astrophysical scenario of the study, we have treated neutron stars orbiting a supermassive black hole (SMBH), in particular, the magnetar PSR J1745-2900 orbiting Sgr A* with the parameter β=10.2, as magnetized test particles. The magnetized particles dynamics shows that the parameter β, negative values of cosmological constant and magnetic charge parameter of the central BH cause a decrease in the ISCO radius. We have compared the effects of the magnetic charge of the Bardeen BH with the spin of rotating Kerr BH and shown that magnetic charge parameter can mimic the spin in the range a/M≃(0,0.7896) when Λ=0 at the range of its values g/M≃(0,0.648).
Highlights
The curvature singularity at the origin of compact objects is formed as a result of a gravitational collapse of the end state of the evolution of massive stars
We look for possible ways to distinguish the effects of the magnetic charge of regular Bardeen black hole in Anti-de Sitter spacetime and the rotating Kerr black hole on the dynamics of the magnetized particles with the parameter β = 10.2 for the different values of the cosmological constant
This work is devoted to the investigation of the test particle motion around a static regular Bardeen black hole in Anti-de Sitter spacetime
Summary
The curvature singularity at the origin of compact objects is formed as a result of a gravitational collapse of the end state of the evolution of massive stars. A black hole can be considered as immersed in an external asymptotically uniform magnetic field [61], and due to spacetime curvature, the structure of the electromagnetic field will be changed in the black hole close environment These modifications, at the same time, affect different properties of a black hole [62–67]. For more studies on the electromagnetic field structure and particle motion around black holes in different gravity models, see, e.g., [22,81–114]. We study the neutral and magnetized particles motion around a Bardeen regular black hole in Anti-de Sitter spacetime.
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