Was it Really a Kerr Black Hole That EHT Imaged in 2019?

Chandrachur Chakraborty

doi:10.1007/978-3-031-90186-7_29

Was it Really a Kerr Black Hole That EHT Imaged in 2019?

Chandrachur Chakraborty^*

^*Corresponding author for this work

Manipal Centre for Natural Sciences, Manipal

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

By using the working hypothesis of a Kerr black hole (BH), the Event Horizon Telescope was able to map M87* to the Kerr BH, and it was shown that the observed image of M87* is generally consistent with what would be expected for a Kerr black hole’s shadow. Here, it is demonstrated that M87* is not certainly a Kerr BH, but rather that it might be a Kerr naked singularity, or a BH/naked singularity with a gravitomagnetic monopole, since the alternatives to the Kerr BH cannot be ruled out.

Original language	English
Title of host publication	The Relativistic Universe
Subtitle of host publication	From Classical to Quantum - Proceedings of the International Symposium on Recent Developments in Relativistic Astrophysics, ISRA 2023
Editors	Shubhrangshu Ghosh, A.R. Rao
Publisher	Springer Science and Business Media B.V.
Pages	369-376
Number of pages	8
ISBN (Print)	9783031901850
DOIs	https://doi.org/10.1007/978-3-031-90186-7_29
Publication status	Published - 2025
Event	1st International Symposium on Recent Developments in Relativistic Astrophysics, ISRA 2023 - Gangtok, India Duration: 11-12-2023 → 13-12-2023

Publication series

Name	Astrophysics and Space Science Proceedings
Volume	61
ISSN (Print)	1570-6591
ISSN (Electronic)	1570-6605

Conference

Conference	1st International Symposium on Recent Developments in Relativistic Astrophysics, ISRA 2023
Country/Territory	India
City	Gangtok
Period	11-12-23 → 13-12-23

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
General Physics and Astronomy
Spectroscopy
Computer Science Applications
Space and Planetary Science

Access to Document

10.1007/978-3-031-90186-7_29

Cite this

Chakraborty, C. (2025). Was it Really a Kerr Black Hole That EHT Imaged in 2019? In S. Ghosh, & A. R. Rao (Eds.), The Relativistic Universe: From Classical to Quantum - Proceedings of the International Symposium on Recent Developments in Relativistic Astrophysics, ISRA 2023 (pp. 369-376). (Astrophysics and Space Science Proceedings; Vol. 61). Springer Science and Business Media B.V.. https://doi.org/10.1007/978-3-031-90186-7_29

Chakraborty, Chandrachur. / Was it Really a Kerr Black Hole That EHT Imaged in 2019?. The Relativistic Universe: From Classical to Quantum - Proceedings of the International Symposium on Recent Developments in Relativistic Astrophysics, ISRA 2023. editor / Shubhrangshu Ghosh ; A.R. Rao. Springer Science and Business Media B.V., 2025. pp. 369-376 (Astrophysics and Space Science Proceedings).

@inproceedings{7d7983006c9844ae953c7fb5494bd2d3,

title = "Was it Really a Kerr Black Hole That EHT Imaged in 2019?",

abstract = "By using the working hypothesis of a Kerr black hole (BH), the Event Horizon Telescope was able to map M87* to the Kerr BH, and it was shown that the observed image of M87* is generally consistent with what would be expected for a Kerr black hole{\textquoteright}s shadow. Here, it is demonstrated that M87* is not certainly a Kerr BH, but rather that it might be a Kerr naked singularity, or a BH/naked singularity with a gravitomagnetic monopole, since the alternatives to the Kerr BH cannot be ruled out.",

author = "Chandrachur Chakraborty",

note = "Publisher Copyright: {\textcopyright} The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.; 1st International Symposium on Recent Developments in Relativistic Astrophysics, ISRA 2023 ; Conference date: 11-12-2023 Through 13-12-2023",

year = "2025",

doi = "10.1007/978-3-031-90186-7\_29",

language = "English",

isbn = "9783031901850",

series = "Astrophysics and Space Science Proceedings",

publisher = "Springer Science and Business Media B.V.",

pages = "369--376",

editor = "Shubhrangshu Ghosh and A.R. Rao",

booktitle = "The Relativistic Universe",

}

Chakraborty, C 2025, Was it Really a Kerr Black Hole That EHT Imaged in 2019? in S Ghosh & AR Rao (eds), The Relativistic Universe: From Classical to Quantum - Proceedings of the International Symposium on Recent Developments in Relativistic Astrophysics, ISRA 2023. Astrophysics and Space Science Proceedings, vol. 61, Springer Science and Business Media B.V., pp. 369-376, 1st International Symposium on Recent Developments in Relativistic Astrophysics, ISRA 2023, Gangtok, India, 11-12-23. https://doi.org/10.1007/978-3-031-90186-7_29

Was it Really a Kerr Black Hole That EHT Imaged in 2019? / Chakraborty, Chandrachur.
The Relativistic Universe: From Classical to Quantum - Proceedings of the International Symposium on Recent Developments in Relativistic Astrophysics, ISRA 2023. ed. / Shubhrangshu Ghosh; A.R. Rao. Springer Science and Business Media B.V., 2025. p. 369-376 (Astrophysics and Space Science Proceedings; Vol. 61).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution