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Particle dynamics and shadow of a regular non-minimal magnetic black hole

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Abstract

In this paper, we study the dynamics of a test particle around a regular black hole (BH) in a non-minimal Einstein-Yang-Mills (EYM) theory and examine the BH shadow. The EYM theory is a non-minimally coupled theory in which curvature couples to non-Abelian gauge fields. We investigate particle motion with parameters in EYM BH for massless and massive particles. This work provides the horizon structure, photon radius and inner stable circular orbit (ISCO) of a mass particle with EYM BH parameters. An analysis is provided of the effective potential as well as the possible orbits for test particles under various EYM BH parameters values. In timelike radial geodesics, we find that for smaller values of magnetic charge, particles following a timelike radial geodesic are more hasty in EYM BH, and hence arrive at the center faster than those traveling a Schwarzschild BH geodesic. However, at larger values of the magnetic charge, the inverse effect is observed. The effect of model parameters is investigated in order to study the ISCO, photon radius, orbit stability (Lyapunov exponent), and effective force on particles for the BH in the EYM theory. Finally, we investigate the BH shadow. We find that higher magnetic charge values and non-minimal coupling parameters result in smaller shadow radius values.

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Acknowledgements

We are thankful to the Editor and anonymous Referees for their constructive suggestions and comments.

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  1. Department of Physics, Al-Hussein Bin Talal University, P. O. Box: 20, Ma’an, 71111, Jordan

    Ahmad Al-Badawi & M. Q. Owaidat

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  1. Ahmad Al-Badawi
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Correspondence to Ahmad Al-Badawi.

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Al-Badawi, A., Owaidat, M.Q. Particle dynamics and shadow of a regular non-minimal magnetic black hole. Gen Relativ Gravit 55, 131 (2023). https://doi.org/10.1007/s10714-023-03180-x

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