Abstract.
In this study, we have derived electric and magnetic spherically symmetric black holes for the class \(f(R)=R+\zeta R^{2}\) without assuming any restrictions on the Ricci scalar. These black holes asymptotically behave as the de Sitter spacetime under certain constrains. We have shown that the magnetic charge contributes in the metric spacetime similarly to the electric charge. The most interesting feature of some of these black holes is the fact that the Cauchy horizon is not identical to the event horizon. We have calculated the invariants of Ricci and Kretschmann scalars to investigate the nature of singularities of such black holes. Also, we have calculated the conserved quantities to match the constants of integration with the physical quantities. Finally, the thermodynamical quantities, like Hawking temperature, entropy, etc., have been evaluated and the validity of the first law of thermodynamics has been verified.
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Nashed, G.G.L. Spherically symmetric charged black holes in f(R) gravitational theories. Eur. Phys. J. Plus 133, 18 (2018). https://doi.org/10.1140/epjp/i2018-11849-7
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DOI: https://doi.org/10.1140/epjp/i2018-11849-7