Shadows and negative precession in non-Kerr spacetime

Abstract

It is now known that the shadow is not only the property of a black hole, it can also be cast by other compact objects like naked singularities. However, there exist some novel features of the shadow of the naked singularities which are elaborately discussed in some recent articles. In the earlier literature, it is also shown that a naked singularity may admit negative precession of bound timelike orbits which cannot be seen in Schwarzschild and Kerr black hole spacetimes. This distinguishable behavior of timelike bound orbit in the presence of the naked singularity along with the novel features of the shadow may be useful to distinguish between a black hole and a naked singularity observationally. However, in this paper, it is shown that deformed Kerr spacetime can allow negative precession of bound timelike orbits when the central singularity of that spacetime is naked. We also show that negative precession and shadow both can exist simultaneously in deformed Kerr naked singularity spacetime. Therefore, any observational evidence of negative precession of bound orbits, along with the central shadow may indicate the presence of a deformed Kerr naked singularity.

13 pages, 20 figures

References in corpus (17)

• First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring
• Black Hole Shadows, Photon Rings, and Lensing Rings
• An Update on Monitoring Stellar Orbits in the Galactic Center
• A Metric for Rapidly Spinning Black Holes Suitable for Strong-Field Tests of the No-Hair Theorem
• A new method for shadow calculations: application to parameterised axisymmetric black holes
• Non-Spinning Black Holes in Alternative Theories of Gravity
• Shadow of five-dimensional rotating Myers-Perry black hole
• New parametrization for spherically symmetric black holes in metric theories of gravity
• Black hole shadow in a general rotating spacetime obtained through Newman-Janis algorithm
• Black hole mimicker hiding in the shadow: Optical properties of the $\gamma$-metric
• Complete analytic solution of the geodesic equation in Schwarzschild--(anti) de Sitter space--times
• Shadow of a Naked Singularity without Photon Sphere
• Motion of spinning test bodies in Kerr spacetime
• Influence of a plasma on the observational signature of a high-spin Kerr black hole
• Strong gravitational lensing by a strongly naked null singularity
• Towards an observational test of black hole versus naked singularity at the galactic center
• Geodesic Structure of Naked Singularities in AdS${}_3$ Spacetime

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• Shadows and rings of the Kehagias-Sfetsos black hole surrounded by thin disk accretion
• Probing Geometric Proca in Metric-Palatini Gravity with Black Hole Shadow and Photon Motion
• Synchrotron emitting Komissarov torus around naked singularities