Towards an observational test of black hole versus naked singularity at the galactic center

Abstract

While the event horizon of a black hole could cast a shadow that was observed recently, a central singularity without horizon could also give rise to such a feature. This leaves us with a question on the nature of the supermassive black holes at the galactic centers, and if they admit an event horizon necessarily. We point out that observations of motion of stars around the galactic center should give a clear idea of the nature of this central supermassive object. We examine and discuss here recent developments that indicate intriguing behavior of the star motions that could possibly distinguish the existence or otherwise of an event horizon at the galactic center. We compare the motion of the S2 star with these theoretical results, fitting the observational data with theory, and it is seen that the star motions and precession of their orbits around the galactic center provide important clues on the nature of this central compact object.

arXiv comment12 pages, 9 figures

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Cited by in corpus (20)

• Shadow of a Naked Singularity without Photon Sphere
• Thin accretion disk in the Simpson-Visser black-bounce and wormhole spacetimes
• Shadows and negative precession in non-Kerr spacetime
• Shadow of nulllike and timelike naked singularities without photon spheres
• Testing black hole mimickers with the Event Horizon Telescope image of Sagittarius A${}^{\ast }$
• Black holes surrounded by Einstein clusters as models of dark matter fluid
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• Synchrotron emitting Komissarov torus around naked singularities
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• The effect of loop quantum gravitational rainbow functions on the formation of naked singularities