Shadows and precession of orbits in rotating Janis-Newman-Winicour spacetime

Abstract

In this paper, we construct the rotating Janis-Newman-Winicour (JNW) naked singularity spacetime using Newman-Janis Algorithm (NJA). We analyse NJA with and without complexification methods and find that the energy conditions do satisfied when we skip the complexification step. We study the shadows cast by rotating JNW naked singularity and compare them with the shadows cast by the Kerr black hole. We find that the shadow of the rotating naked singularity can be distinguished from the shadow of the Kerr black hole. While we analyse the precession of timelike bound orbits in rotating JNW spacetime, we find that it can have a negative (or opposite) precession, which is not present in the Kerr black hole case. These novel signatures of the shadow and orbital precession in rotating JNW naked singularity spacetime could be important in the context of the recent observation of the shadow of the M87 galactic center and the stellar dynamics of `S-stars' around Milkyway galactic center.

14 pages, 13 figures

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• Toward General-Relativistic Magnetohydrodynamics Simulations in Stationary Non-Vacuum Spacetimes
• Imaging ultra-compact objects with radiatively inefficient accretion flows
• Relativistic time delay analysis of pulsar signals near ultra-compact objects
• Modelling the Sgr A${}^{\ast }$ and M87${}^{\ast }$ shadows by using the Kerr-Taub-NUT metrics in the presence of a scalar field
• A class of charged-Taub-NUT-scalar metrics via Harison and Ehlers Transformations
• Retrograde Precession of Relativistic Orbits and the Quest for Charged Black Holes
• Nonspherically-symmetric black hole in Einstein-massless scalar theory
• Photon surfaces, shadows and accretion disks in gravity with minimally coupled scalar field
• 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