Thin accretion disks and charged rotating dilaton black holes

Abstract

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.

15 pages, 6 figures, to appear in EPJC

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Cited by in corpus (5)

• Test particle motion around black hole in Einstein-Maxwell-scalar theory
• Circular Orbits Structure and Thin Accretion Disks around Kerr Black Holes with Scalar Hair
• Thin accretion disks around rotating black holes in $4D$ Einstein-Gauss-Bonnet gravity
• Thin accretion disks around a black hole in Einstein-Aether-scalar theory
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