Remarks on nonsingular models of Hayward and magnetized black hole with rational nonlinear electrodynamics

Abstract

A Hayward black hole and magnetically charged black hole based on rational nonlinear electrodynamics with the Lagrangian $\mathcal{L}=-\mathcal{F}/(1+2\beta \mathcal{F})$ ($\mathcal{F}$ is a field invariant) are considered. It was shown that the metric function in both models possesses a de Sitter core without singularities as $r\to 0$. The behavior of the Hawking temperature and the heat capacity in these models are similar. The phase transitions take place when the Hawking temperature has a maximum, and black holes are thermodynamically stable at some event horizon radii when the heat capacity is positive. We show that the source of gravity in the Hayward model is questionable.

16 pages, 6 figures, 1 table, published in Gravitation and Cosmology

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