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.
Highlights
Over the last century, general relativity (GR) has been exceedingly successful as a theory in describing gravitational phenomena
The discovery of gravitational waves resulting from a binary black hole merger [1], and the first released image of a black hole shadow by the Event Horizon Telescope [2], are some of the recent success stories
In this paper we have studied the properties of thin accretion disks around scalarized black holes in EsGB theory of gravity
Summary
General relativity (GR) has been exceedingly successful as a theory in describing gravitational phenomena. It is well known that in a binary system the accretion process can take place around compact objects (a black hole or a neutron star) where strong gravitational effects are important [31]–[32]. The study of disk properties can be used to test gravity in these extreme regions and explore possible deviations from GR and generalized theories of gravity In this regard thin accretion disks have been investigated in f (R) modified gravity, Horava-Lifshitz gravity, scalar-vector-tensor gravity, brane-world scenarios and Einstein-Maxwell-dilaton gravity [33]–[40]. In the present paper we study the accretion process in thin disks around scalarized black holes in EsGB gravity and investigate the effects of scalarization on their properties.
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