https://doi.org/10.1140/epjp/s13360-023-04604-y
Regular Article
Epicyclic motions and constraints on the charged stringy black hole spacetime
1
Institute for Theoretical Physics and Cosmology, Zhejiang University of Technology, 310023, Hangzhou, China
2
Central Asian University, Milliy Bog Street 264, 111221, Tashkent, Uzbekistan
3
Institute of Fundamental and Applied Research, National Research University TIIAME, Kori Niyoziy 39, 100000, Tashkent, Uzbekistan
4
National University of Uzbekistan, 100174, Tashkent, Uzbekistan
5
Physics Department, State University of Tetovo, Ilinden Street nn, 1200, Tetovo, North Macedonia
6
New Uzbekistan University, Mustaqillik Ave. 54, 100007, Tashkent, Uzbekistan
7
Ulugh Beg Astronomical Institute, Astronomy St. 33, 100052, Tashkent, Uzbekistan
8
Tashkent State Technical University, 100095, Tashkent, Uzbekistan
9
Tashkent University of Applied Sciences, Gavhar Str. 1, 100149, Tashkent, Uzbekistan
Received:
9
June
2023
Accepted:
13
October
2023
Published online:
9
November
2023
The purpose of this paper is to examine the epicyclic motion of charged particles in the vicinity of a magnetically charged stringy black hole subject to an electromagnetic field. This investigation is motivated by the established fact that magnetic fields have a significant impact on the motion of charged particles in the vicinity of a black hole. It has been observed that the magnetic coupling parameter has a comparable impact on the motion of magnetic monopole charge, leading to an increase/decrease in the radius of the innermost stable circular orbit (ISCO) that plays a crucial role in setting the accretion disk’s inner edge. Further, we analyze the characteristics of the epicyclic motion and determine the generic form for the epicyclic frequencies. Our results demonstrate that the existence of the magnetic coupling parameter can account for the observed resonance of high-frequency QPOs from selected three specific microquasars. We have applied the Monte Carlo simulations with the observed frequencies for three selected microquasars to constrain the parameters of the magnetically charged stringy black holes as well as coupling parameters that describe the interaction between the particle and the black hole. Our results demonstrate that the charge of stringy black hole can be constrained to be 
by applying the generic expressions of the epicyclic frequencies for the selected microquasars with QPO data. Finally, we study in detail the radiation properties of the accretion disk in the close vicinity of black hole. We show that the magnetic coupling parameter can have significant influence on the radiation flux of the accretion disk.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
