Thin accretion disks and charged rotating dilaton black holes

Hamid Reza Sepangi; Malihe Heydari-Fard; Mohaddese Heydari-Fard

Thin accretion disks and charged rotating dilaton black holes

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arxiv 2004.05552 v1 pith:MSPDWWIE submitted 2020-04-12 gr-qc hep-th

Mohaddese Heydari-fard , Malihe Heydari-Fard , Hamid Reza Sepangi This is my paper · ORCID

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Einstein-Maxwell-dilaton theory is an interesting theory of gravity for studying scalar fields in the context of no-hair theorem. In this work, we consider static charged dilaton and charged, slowly rotating dilaton black holes in Einstein-Maxwell-dilaton gravity. We investigate the accretion process in thin disks around such black holes, using the Novikov-Thorne model. The electromagnetic flux, temperature distribution, energy conversion efficiency and also innermost stable circular orbits of thin disks are obtained and effects of dilaton and rotation parameters are studied. For the static and slowly rotating black holes the results are compared to that of Schwarzschild and Kerr, respectively.

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The shadow and quasinormal modes of the asymptotically flat hairy black holes with a dilaton potential
gr-qc 2025-08 conditional novelty 5.0 of 10

For exact asymptotically flat hairy charged black holes with a dilaton potential, the shadow radius, photon-orbit Lyapunov exponent, and scalar quasinormal frequencies are computed, showing strong coupling dependence ...

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