https://doi.org/10.1140/epjc/s10052-022-10229-9
Regular Article - Theoretical Physics
Motion of spinning particles around electrically charged black hole in Eddington-inspired Born–Infeld gravity
1
School of Physical Science and Technology, Southwest University, 400715, Chongqing, China
2
Department of Physics, Nanchang University, 330031, Nanchang, China
3
Center for Relativistic Astrophysics and High Energy Physics, Nanchang University, 330031, Nanchang, China
4
Lanzhou Center for Theoretical Physics, Key Laboratory of Theoretical Physics of Gansu Province, School of Physical Science and Technology, Lanzhou University, 730000, Lanzhou, China
5
Institute of Theoretical Physics and Research Center of Gravitation, Lanzhou University, 730000, Lanzhou, China
Received:
13
November
2021
Accepted:
20
March
2022
Published online:
4
April
2022
A test particle possessing spin angular momentum moves along a non-geodesic path due to an additional spin-curvature force. We study the spinning test particle moving in the vicinity of the electrically charged black hole formation in Eddington-inspired Born–Infeld (EiBI) gravity. Through the numerical analysis of its effective potential and orbits, it is found that the orbital eccentricity reduces as the deviation parameter 
increases. By comparing the orbits for the observed stars around Sagittarius A*, we conclude that the observed orbits with too large radii can not give a stringent constraint with acceptable magnitude. To dig out the potential observation effects of the relations between the orbits and parameter , we mainly focus on the orbits in the vicinity of black hole in this paper. The parameters of inner most stable circular orbit (ISCO) decrease monotonously with when the spin angular momentum is small, however they change non-monotonously with when the spin is large enough. Moreover, the spin dependences of ISCO parameters have similar behavior to that of Reissner–Nordström (RN) black hole. We analyze the causality of the circular orbits by using the superluminal constraint condition as well. As a result, two new parameter regions may emerge in case of large , where the particle has two stable circular orbits with one subluminal and the other superluminal.
© The Author(s) 2022
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