Regularizing the JNW and JMN naked singularities
Abstract 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 fiel...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2023-05-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-023-11558-z |
| _version_ | 1797789620724826112 |
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| author | Kunal Pal Kuntal Pal Pratim Roy Tapobrata Sarkar |
| author_facet | Kunal Pal Kuntal Pal Pratim Roy Tapobrata Sarkar |
| author_sort | Kunal Pal |
| collection | DOAJ |
| description | Abstract 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. |
| first_indexed | 2024-03-13T01:53:16Z |
| format | Article |
| id | doaj.art-3066138513c8478ca1b81784ef3cf4a0 |
| institution | Directory Open Access Journal |
| issn | 1434-6052 |
| language | English |
| last_indexed | 2024-03-13T01:53:16Z |
| publishDate | 2023-05-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | European Physical Journal C: Particles and Fields |
| spelling | doaj.art-3066138513c8478ca1b81784ef3cf4a02023-07-02T11:24:32ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522023-05-0183511510.1140/epjc/s10052-023-11558-zRegularizing the JNW and JMN naked singularitiesKunal Pal0Kuntal Pal1Pratim Roy2Tapobrata Sarkar3Department of Physics, Indian Institute of Technology KanpurDepartment of Physics, Indian Institute of Technology KanpurHarish-Chandra Research InstituteDepartment of Physics, Indian Institute of Technology KanpurAbstract 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.https://doi.org/10.1140/epjc/s10052-023-11558-z |
| spellingShingle | Kunal Pal Kuntal Pal Pratim Roy Tapobrata Sarkar Regularizing the JNW and JMN naked singularities European Physical Journal C: Particles and Fields |
| title | Regularizing the JNW and JMN naked singularities |
| title_full | Regularizing the JNW and JMN naked singularities |
| title_fullStr | Regularizing the JNW and JMN naked singularities |
| title_full_unstemmed | Regularizing the JNW and JMN naked singularities |
| title_short | Regularizing the JNW and JMN naked singularities |
| title_sort | regularizing the jnw and jmn naked singularities |
| url | https://doi.org/10.1140/epjc/s10052-023-11558-z |
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