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{\large{\bf Optical Aspect of Cosmological Black Holes in Einstein-Maxwell-Dilaton Theory} }
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\vskip0.5\baselineskip{\bf \underline{Mohamed Amin Rbah}$^{1}$, Hajar Belmahi$^{2}$}
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\vskip0.5\baselineskip{\em$^{1}$Faculty of Sciences, Mohammed V University of Rabat, Rabat, Morocco \$^{2}$Faculty of Sciences, Mohammed V University of Rabat, Rabat, Morocco }\
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Motivated by string theory scenarios, we study the optical aspect of AdS black holes in Einstein-Maxwell-dilaton theory. We investigate the shadows and the deflection angle of light rays by such cosmological black holes. For non-rotating solutions, we observe perfect circular shadows whose sizes depend on parameters such as the charge and cosmological constant. Using the Newman-Janis formalism and the Hamilton-Jacobi algorithm, we examine rotating black hole shadows and reveal that their size and shape are influenced by the rotation parameter. By comparing with Event Horizon Telescope (EHT) data, we impose constraints on these parameters. Additionally, we compute the deflection angle of light rays near these cosmological black holes. Our analysis shows that the cosmological constant's effect on the deflection angle depends on the coupling between the black hole parameters. When rotation is introduced, this effect becomes analogous to that seen in ordinary AdS black holes. These findings offer insights into the optical properties of AdS black holes in Einstein-Maxwell-dilaton theory and their potential connection to empirical data.
Currently, I am also developing works related to the Swampland Programme, aiming to explore the implications of quantum gravity constraints on effective field theories. This ongoing research bridges the optical properties of black holes with fundamental aspects of high-energy physics, offering a deeper understanding of the connections between string theory, quantum gravity, and cosmology.
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\bibitem{ref1} H. Belmahi and M. A. Rbah, Optical Aspect of Cosmological Black Holes in Einstein-Maxwell-Dilaton Theory, arXiv:2409.08903.
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| Abstract Category | Astrophysics & Cosmology |
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