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

Divyesh Solanki (Sardar Vallabhbhai National Institute of Technology, Surat, Gujarat, 395007, India) ; Parth Bambhaniya (International Center for Cosmology, Charusat University, Anand, Gujarat, 388421, India) ; Dipanjan Dey (International Center for Cosmology, Charusat University, Anand, Gujarat, 388421, India) ; Pankaj Joshi (International Center for Cosmology, Charusat University, Anand, Gujarat, 388421, India) ; Kamlesh Pathak (Department of Physics, S.V National Institute of Technology, Surat, Gujarat, 395007, India)

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.

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      "source": "Springer", 
      "value": "In this paper, we construct the rotating Janis\u2013Newman\u2013Winicour (JNW) naked singularity spacetime using Newman\u2013Janis 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 \u2018S-stars\u2019 around Milkyway galactic center."
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Published on:
27 January 2022
Publisher:
Springer
Published in:
European Physical Journal C , Volume 82 (2022)
Issue 1
Pages 1-13
DOI:
https://doi.org/10.1140/epjc/s10052-022-10045-1
arXiv:
2109.14937v1
Copyrights:
The Author(s)
Licence:
CC-BY-4.0

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