A rotating modified JNW spacetime as a Kerr black hole mimicker

Abstract The Event Horizon Telescope has recently observed the images and shadows of the compact objects M87* and Sgr A* at the centres of the galaxies Messier 87 and Milky Way. This has opened up a new window in observational astronomy to probe and test gravity and fundamental physics in the strong...

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Bibliographic Details
Published inJournal of cosmology and astroparticle physics Vol. 2023; no. 11; pp. 60 - 80
Main Authors Pal, Kunal, Pal, Kuntal, Shaikh, Rajibul, Sarkar, Tapobrata
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 01.11.2023
Subjects
Astronomy
Black holes
Elliptical galaxies
Event horizon
GR black holes
Parameters
quantum black holes
Regularization
Relativity
Rotation
Shadows
Singularities
Spacetime
Wormholes
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Summary:Abstract The Event Horizon Telescope has recently observed the images and shadows of the compact objects M87* and Sgr A* at the centres of the galaxies Messier 87 and Milky Way. This has opened up a new window in observational astronomy to probe and test gravity and fundamental physics in the strong-field regime. In this paper, we construct a rotating version of a modified Janis-Newman-Winicour metric obtained through the Simpson-Visser regularisation procedure and constrain the metric parameters using the observed shadows of M87* and Sgr A*. Depending on parameter values, the spacetime metric represents either a naked singularity or a wormhole. We find that the naked singularity case is not consistent with observations, as it casts a shadow that is much smaller than the observed ones. On the other hand, the shadow formed by the wormhole branch, depending on the parameter values, is consistent with the observations. We put constraints on the wormhole throat radius by comparing the shadow with the observed ones of M87* and Sgr A*.
ISSN:1475-7516
1475-7516
DOI:10.1088/1475-7516/2023/11/060