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

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 t...

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Bibliographic Details
Published in:Physics letters. B 2021-05, Vol.816, p.136276, Article 136276
Main Authors: Heydari-Fard, Mohaddese, Sepangi, Hamid Reza
Format: Article
Language:English
Subjects:
Accretion and accretion disk
Modified theories of gravity
Physics of black holes
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Summary: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.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2021.136276