Kerr-Newman Black Holes in Weyl-Cartan Theory: Shadows and EHT constraints

Abstract

With the recent release of the black hole image of Sgr A* alongside the earlier image of M87*, one can achieve an in-depth understanding of gravitational physics at the horizon scale. According to the Event Horizon Telescope (EHT) collaboration, the observed image is consistent with the expected appearance of a Kerr black hole. In the present work, we consider Kerr-Newman black holes in Weyl-Cartan theory as a supermassive black hole (BH) and evaluate the parameters of the model with shadow size estimates done by the observations of M87* and Sgr A* from EHT. Such a study can be a possible way to distinguish Weyl-Cartan theory from general relativity and ensure the validity of the idea. Besides, we calculate the energy emission rate for the corresponding BH and discuss how the model's parameters affect the emission of particles around the black hole. With this investigation, we are able to examine the time evolution and lifetime of the black hole in such a theory of gravity.

28 pages, 12 figures, 5 tables, Accepted for publication in Phys. Dark Universe

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• Shadow Cast by the Kerr MOG Black Hole under the Influence of Plasma and Constraints from EHT Observations
• Modelling the Sgr A${}^{\ast }$ and M87${}^{\ast }$ shadows by using the Kerr-Taub-NUT metrics in the presence of a scalar field
• Shadow of F(R)-EH Black Hole and Constraints from EHT Observations
• Shadow analysis of an approximate rotating black hole solution with weakly coupled global monopole charge
• Shadows of naked singularities and superspinars related to the revisited Kerr-de Sitter spacetimes
• Charged particle geodesics and closed timelike curves in an electromagnetic universe