Light trajectory and shadow shape in the rotating naked singularity

Abstract

In this paper, we investigate the light trajectories and shadow properties in the rotating version of null naked singularity (NNS) spacetime which is derived using the Newman- Janis algorithm without complexification method. We discuss some of the geometrical properties and causal structure of Rotating Naked Singularity (RNS) spacetime. The gravitational lensing in a rotating naked singularity is analyzed, and the results are compared to those of a Kerr black hole. In the case of a Kerr black hole, the photon sphere exists for both prograde and retrograde photon orbits, whereas for RNS, the photon sphere exists only for retrograde photon orbits. As a result, the naked singularity projects an arc-shaped shadow that differs from the contour-shaped shadow cast by a Kerr black hole.

12 pages, 4 figures

References in corpus (27)

• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way
• First Sagittarius A* Event Horizon Telescope Results. VI: Testing the Black Hole Metric
• Black Hole Shadows, Photon Rings, and Lensing Rings
• First Sagittarius A* Event Horizon Telescope Results. V. Testing Astrophysical Models of the Galactic Center Black Hole
• First Sagittarius A* Event Horizon Telescope Results. III: Imaging of the Galactic Center Supermassive Black Hole
• Generating rotating regular black hole solutions without complexification
• First Sagittarius A* Event Horizon Telescope Results. II. EHT and Multi-wavelength Observations, Data Processing, and Calibration
• First Sagittarius A* Event Horizon Telescope Results. IV. Variability, Morphology, and Black Hole Mass
• Black hole mimicker hiding in the shadow: Optical properties of the $\gamma$-metric
• QED Effect on Black Hole Shadow
• Gravastar Shadows
• Millimeter light curves of Sagittarius A* observed during the 2017 Event Horizon Telescope campaign
• Shadow of a Naked Singularity without Photon Sphere
• Shadows and rings of the Kehagias-Sfetsos black hole surrounded by thin disk accretion
• Can strong gravitational lensing distinguish naked singularities from black holes?
• Shadow of nulllike and timelike naked singularities without photon spheres
• Shadows and precession of orbits in rotating Janis-Newman-Winicour spacetime
• Strong curvature naked singularities in spherically symmetric perfect fluid collapse
• Strong gravitational lensing by a strongly naked null singularity
• Perihelion Precession and Shadows near Blackholes and Naked Singularities
• Selective Dynamical Imaging of Interferometric Data
• Global visibility of a strong curvature singularity in nonmarginally bound dust collapse
• Comment on `Spinning loop black holes' [arXiv:1006.0232]
• Globally visible singularity in an astrophysical setup
• Comparing thin accretion disk properties of naked singularities and black holes
• Comparing Shadows of Blackhole and Naked Singularity

Cited by in corpus (12)

• Mutual Influence of Photon Sphere and Non-Commutative Parameter in Various Non-Commutative Black Holes: Part I- Towards evidence for WGC
• Kerr-Newman Black Holes in Weyl-Cartan Theory: Shadows and EHT constraints
• Energy extraction from Janis-Newman-Winicour naked singularity
• The ring-shaped shadow of rotating naked singularity with a complete photon sphere
• Instability of a Kerr-type naked singularity due to light and matter accretion and its shadow
• Spin precession frequencies of a test gyroscope around a naked singularity and quasi-periodic oscillations
• Modelling the Sgr A${}^{\ast }$ and M87${}^{\ast }$ shadows by using the Kerr-Taub-NUT metrics in the presence of a scalar field
• Sgr A* Shadow Study with KTN Space Time and Investigation of NUT Charge Existence
• Shadow geometry of Kerr MOG naked singularity and analysis of accretion disk luminosity
• Rotational Metric: A Solution to Einstein's Clock-Rate Problem and Its Magnetospheric Applications
• Photon Ring Dimming as a Signature of Photon-Axion Conversion in Janis-Newman-Winicour Naked Singularity
• Optical appearance of regularized compact objects without an exterior photon sphere