Shadows from spinning black holes in extended gravity

Abstract

When the the shadow image of a supermassive black hole in the center of M87 was obtained a new era in the observational astrophysics began. The resolution improvement would allow to test extended gravity models at event horizon scales. We develop the method allowing to take into account the black hole rotation in black hole shadow modelling. It is demonstrated that the shadow of a black hole with a diameter smaller than $4R_{Sw}$ ($R_{Sw}=2M$) cannot be represented in the terms of pure Kerr-Newman metric. Therefore, the detection of a shadow of such size would indicate that further expansions must be taken into account. This fact could give new indications on the detailed form of the theory of gravity at the considered scales.}

arXiv commentAccepted for publication in Journal of Experimental and Theoretical Physics

References in corpus (17)

• f(R) Theories Of Gravity
• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• The Confrontation between General Relativity and Experiment
• f(R) theories
• Extended Theories of Gravity
• A direct empirical proof of the existence of dark matter
• Tests of general relativity with GW150914
• Testing General Relativity with Present and Future Astrophysical Observations
• Black holes on the brane
• General second order scalar-tensor theory, self tuning, and the Fab Four
• Influence of a plasma on the shadow of a spherically symmetric black hole
• Black hole shadow in an asymptotically-flat, stationary, and axisymmetric spacetime: The Kerr-Newman and rotating regular black holes
• Constraints on a charge in the Reissner--Nordström metric for the black hole at the Galactic Center
• Black hole solutions with dilatonic hair in higher curvature gravity
• Shadow of a black hole at cosmological distance
• Constraints on tidal charge of the supermassive black hole at the Galactic Center with trajectories of bright stars
• Horndeski gravity without screening in binary pulsars

Cited by in corpus (7)

• Charged 4D Einstein-Gauss-Bonnet-AdS Black Holes: Shadow, Energy Emission, Deflection Angle and Heat Engine
• Analytical study of higher-order ring images of accretion disk around black hole
• Silhouettes of invisible black holes
• Black Hole Shadows Constrain Extended Gravity
• Shadows of a generic class of spherically symmetric, static spacetimes
• Extended Gravity Constraints at Different Scales
• Visible shapes of black holes M87* and SgrA*