Thin accretion disk signatures of scalarized black holes in Einstein-scalar-Gauss-Bonnet gravity

Abstract

Einstein-scalar-Gauss-Bonnet gravity has recently been known to exhibit spontaneous scalarization. In the presence of the Gauss-Bonnet term the no-hair theorem can be evaded and novel black hole solutions with non-trivial scalar fields have been found besides the general relativistic solutions. In this paper, we aim to investigate the possibility of observationally testing Einstein-scalar-Gauss-Bonnet gravity using thin accretion disk properties around such scalarized black holes. Using the Novikov-Thorne model, we numerically calculate the electromagnetic flux, temperature distribution, emission spectrum, innermost stable circular orbits and energy conversion efficiency of accretion disks around such black holes and compare the results with the standard general relativistic Schwarzschild solution. We find that the accretion disks around scalarized black holes are hotter and more luminous than in general relativity.

13 pages, 3 figures, to appear in PLB

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Cited by in corpus (11)

• Probing a nonlinear electrodynamics black hole with thin accretion disk, shadow and deflection angle with M87* and Sgr A* from EHT
• Thin accretion disk luminosity and its image around rotating black holes in perfect fluid dark matter
• Thin accretion disks around rotating black holes in $4D$ Einstein-Gauss-Bonnet gravity
• Nonlinearly charged black holes: Shadow and Thin-accretion disk
• Shadow of Schwarzschild Black Hole in the Cold Dark Matter Halo
• Thin accretion disk signatures in hybrid metric-Palatini gravity
• Galactic black hole immersed in a dark halo with its surrounding thin accretion disk
• Superradiance scattering of scalar, electromagnetic, and gravitational fields and thin accretion disk around non-commutating Kerr black hole
• Radiative properties of thin accretion disks around rotating short-hairy black holes
• Massive scalar clouds and black hole spacetimes in Gauss-Bonnet gravity
• Embedding Gauss-Bonnet scalarization models in higher dimensional topological theories