Regular Article - Theoretical Physics
Regularizing the JNW and JMN naked singularities
Department of Physics, Indian Institute of Technology Kanpur, 208016, Kanpur, India
2 Harish-Chandra Research Institute, Chhatnag Road, Jhunsi, 211019, Prayagraj, India
3 Homi Bhabha National Institute, Training School Complex, Anushaktinagar, 400094, Mumbai, India
Accepted: 24 April 2023
Published online: 12 May 2023
We extend the method of Simpson and Visser (SV) of regularizing 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 regularized spacetime and explore their stability properties.
© The Author(s) 2023
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