Regularising the JNW and JMN naked singularities
arXiv:2206.11764 · doi:10.1140/epjc/s10052-023-11558-z
Abstract
We extend the method of Simpson and Visser (SV) of regularising a black hole spacetime, to cases where the initial metric represents a globally naked singularity. We choose two particular geometries, the Janis-Newman-Winicour (JNW) metric representing the solution of an Einstein-scalar field system, and the Joshi-Malafarina-Narayan (JMN) metric that represents the asymptotic equilibrium configuration of a collapsing star supported by tangential pressures as the starting configuration. We illustrate several novel features for the modified versions of the JNW and JMN spacetimes. In particular, we show that, depending on the values of the parameters involved the modified JNW metric may represents either a two way traversable wormhole or it may retain the original naked singularity. On the other hand, the SV modified JMN geometry is always a wormhole. Particle motion and observational aspects of these new geometries are investigated and are shown to posses interesting features. We also study the quasinormal modes of different branches of the regularised spacetime and explore their stability properties.
22 Pages, 16 Figures. Discussions added
References in corpus (42)
- Quasinormal modes of black holes and black branes
- Time delay and magnification centroid due to gravitational lensing by black holes and naked singularities
- Black-bounce to traversable wormhole
- Wormholes in Dilatonic Einstein-Gauss-Bonnet Theory
- Shadows of spherically symmetric black holes and naked singularities
- Exact traversable wormhole solution in bumblebee gravity
- Janis-Newman-Winicour and Wyman solutions are the same
- A novel family of rotating black hole mimickers
- Equilibrium configurations from gravitational collapse
- Field sources for Simpson-Visser space-times
- Strong gravitational lensing by wormholes
- Charged black-bounce spacetimes
- Brans wormholes
- Can different black holes cast the same shadow?
- A novel gravitational lensing feature by wormholes
- Wormholes without exotic matter: quasinormal modes, echoes and shadows
- Vaidya spacetimes, black-bounces, and traversable wormholes
- Wormholes, the weak energy condition, and scalar-tensor gravity
- Lorentzian wormholes in Eddington-inspired Born-Infeld gravity
- Novel Einstein-Scalar-Gauss-Bonnet Wormholes without Exotic Matter
- Arbitrarily long-lived quasinormal modes in a wormhole background
- Constraining alternatives to the Kerr black hole
- How to tell the shape of a wormhole by its quasinormal modes
- Charged Ellis Wormhole and Black Bounce
- Quest for realistic non-singular black-hole geometries: Regular-center type
- Scalar perturbations around rotating regular black holes and wormholes: quasi-normal modes, ergoregion instability and superradiance
- Topical Review: Greybody Factors and Quasinormal Modes for Black Holes in Various Theories -- Fingerprints of Invisibles
- Thin accretion disk in the Simpson-Visser black-bounce and wormhole spacetimes
- On black bounces, wormholes and partly phantom scalar fields
- No stable wormholes in Einstein-dilaton-Gauss-Bonnet theory
- Nature of singularity in Einstein-massless scalar theory
- Gravitinos Tunneling From Traversable Lorentzian Wormholes
- Retrolensing by two photon spheres of a black-bounce spacetime
- Negative Pressure and Naked Singularities in Spherical Gravitational Collapse
- Instability of charged and rotating naked singularities
- Generalised Hayward spacetimes: Geometry, matter and scalar quasinormal modes
- Rotating spacetime: black-bounces and quantum deformed black hole
- AdS-Taub-NUT spacetimes and exact black bounces with scalar hair
- On the linear instability of the Ellis-Bronnikov-Morris-Thorne wormhole
- Echoes from Asymmetric Wormholes and Black Bounce
- Black-Bounce in Gravity
- A wormhole geometry from gravitational collapse
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- Einstein Frame Regularization of the JNW Spacetime: From Brans-Dicke Singularity to Ellis Wormhole
- 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