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Motion of charged and magnetized particles around regular black holes immersed in an external magnetic field in modified gravity

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Abstract

We study properties of spacetime around regular black holes (BHs) in modified gravity, so-called regular MOG BH. The motion of the test electrically neutral and charged, and particles with magnetic dipole moment, near the regular MOG BH, considering the BH is immersed in an external, asymptotically uniform magnetic field, have also been investigated. In a study of charged particles’ dynamics, we have shown that the radius of the particle’s innermost stable circular orbits (ISCOs) increases with respect to increasing the parameter of MOG, while as cyclotron frequency grows the ISCO radius decreases. Effects of MOG field on synchrotron radiation by charged particles have also been studied and obtained that the existence of the MOG parameter essentially decreases the total luminosity of the radiation. Moreover, through studies of the dynamics of magnetic dipoles, we have shown that the increase of the MOG and the magnetic coupling parameters lead to an increase of the inner radius and the width of the accretion disk consisting of test magnetized particles. Finally, it is obtained that the range for values of the magnetic coupling parameter for neutron stars orbiting supermassive black holes causes their orbits to be stable.

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Acknowledgements

This research is supported by Grants F-FA-2021-432, F-FA-2021-510, and MRB-2021-527 of the Uzbekistan Ministry for Innovative Development. JR thanks to the ERASMUS+ project 608715-EPP-1-2019-1-UZ-EPPKA2-JP (SPACECOM). DB thanks the Silesian University projects SGS/26/2022 and GAČR, grant number 23-07043S.

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Author notes

  1. Ahmadjon Abdujabbarov, Dilshodbek Bardiev, Bobomurat Ahmedov and Mardon Abdullaev have contributed equally to this work.

Authors and Affiliations

  1. Institute of Fundamental and Applied Research, National Research University TIIAME, Kori Niyoziy 39, 100000, Tashkent, Uzbekistan

    Javlon Rayimbaev & Bobomurat Ahmedov

  2. School of Mathematics and Natural Sciences, New Uzbekistan University, Mustaqillik Ave. 54, 100007, Tashkent, Uzbekistan

    Javlon Rayimbaev

  3. National University of Uzbekistan, 100174, Tashkent, Uzbekistan

    Javlon Rayimbaev, Ahmadjon Abdujabbarov & Bobomurat Ahmedov

  4. Tashkent State Technical University, 100095, Tashkent, Uzbekistan

    Javlon Rayimbaev, Ahmadjon Abdujabbarov & Mardon Abdullaev

  5. Samarkand State University, University Avenue 15, 140104, Samarkand, Uzbekistan

    Javlon Rayimbaev

  6. Ulugh Beg Astronomical Institute, Astronomy St. 33, 100052, Tashkent, Uzbekistan

    Ahmadjon Abdujabbarov, Dilshodbek Bardiev & Bobomurat Ahmedov

  7. Tashkent Institute of Irrigation and Agricultural Mechanization Engineers, Kori Niyoziy 39, 100000, Tashkent, Uzbekistan

    Ahmadjon Abdujabbarov

  8. Research Centre for Theoretical Physics and Astrophysics, Institute of Physics, Silesian University in Opava, Bezručovo nám. 13, Opava, 74601, Czech Republic

    Dilshodbek Bardiev

  9. Karakalpak State University named after Berdakh, Ch.Abdirov Str. 1, 230112, Nukus, Republic of Karakalpakstan, Uzbekistan

    Mardon Abdullaev

  10. Institute of Nuclear Physics, 100214, Tashkent, Uzbekistan

    Ahmadjon Abdujabbarov & Mardon Abdullaev

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  1. Javlon Rayimbaev
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  2. Ahmadjon Abdujabbarov
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Correspondence to Javlon Rayimbaev.

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Rayimbaev, J., Abdujabbarov, A., Bardiev, D. et al. Motion of charged and magnetized particles around regular black holes immersed in an external magnetic field in modified gravity. Eur. Phys. J. Plus 138, 358 (2023). https://doi.org/10.1140/epjp/s13360-023-03979-2

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