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.

12 pages, 9 figures

References in corpus (14)

• An Update on Monitoring Stellar Orbits in the Galactic Center
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• A Periodic Table for Black Hole Orbits
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• Complete analytic solution of the geodesic equation in Schwarzschild--(anti) de Sitter space--times
• Investigating the Relativistic Motion of the Stars Near the Supermassive Black Hole in the Galactic Center
• Motion of spinning test bodies in Kerr spacetime
• Constraints on $R^n$ gravity from precession of orbits of S2-like stars
• Test of Einstein equivalence principle near the Galactic center supermassive black hole
• Innermost stable circular orbits of charged spinning test particles
• The Galactic Center: An Improved Astrometric Reference Frame for Stellar Orbits around the Supermassive Black Hole
• Geodesic structure of Janis-Newman-Winicour space-time
• Natural orbit approximations in single power-law potentials

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
• Shadows and precession of orbits in rotating Janis-Newman-Winicour spacetime
• Precession of timelike bound orbits in Kerr spacetime
• Perihelion Precession and Shadows near Blackholes and Naked Singularities
• Globally visible singularity in an astrophysical setup
• Causal Structure of Singularity in non-spherical Gravitational Collapse
• Revisiting timelike geodesics in the Fisher-Janis-Newman-Winicour-Wyman spacetime
• Energy extraction from Janis-Newman-Winicour naked singularity
• Exact Regular Black Hole Solutions with de Sitter Cores and Hagedorn Fluid
• Comparing thin accretion disk properties of naked singularities and black holes
• Relativistic time delay analysis of pulsar signals near ultra-compact objects
• Retrograde Precession of Relativistic Orbits and the Quest for Charged Black Holes
• Synchrotron emitting Komissarov torus around naked singularities
• Nonspherically-symmetric black hole in Einstein-massless scalar theory
• The effect of loop quantum gravitational rainbow functions on the formation of naked singularities