Sgr A* Shadow Study with KTN Space Time and Investigation of NUT Charge Existence
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866912045583040512 |
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| author | Ghasemi-Nodehi, M. |
| author_facet | Ghasemi-Nodehi, M. |
| contents | In this paper, I investigate the existence of the NUT charge through the KTN spacetime using shadow observations of Sgr A*. I report that the range of my constraint for the NUT charge is between $-$0.5 and 0.5 for Schwarzschild-like and very slowly rotating KTN black holes. This range extends to 1.5 for spins up to $-$2 and $-$1.5 for spins up to 2 based on Keck observations for both 40$^\circ$ and 10$^\circ$ viewing angles. For VLTI observations, Schwarzschild-like and very slowly rotating KTN black holes are excluded for a 40$^\circ$ viewing angle, and the NUT charge is constrained to a very narrow range for a 10$^\circ$ viewing angle. I report that the possibility of having KTN naked singularities in Sgr A* is small, considering the uncertainties in the shadow size. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2409_16591 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Sgr A* Shadow Study with KTN Space Time and Investigation of NUT Charge Existence Ghasemi-Nodehi, M. General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena In this paper, I investigate the existence of the NUT charge through the KTN spacetime using shadow observations of Sgr A*. I report that the range of my constraint for the NUT charge is between $-$0.5 and 0.5 for Schwarzschild-like and very slowly rotating KTN black holes. This range extends to 1.5 for spins up to $-$2 and $-$1.5 for spins up to 2 based on Keck observations for both 40$^\circ$ and 10$^\circ$ viewing angles. For VLTI observations, Schwarzschild-like and very slowly rotating KTN black holes are excluded for a 40$^\circ$ viewing angle, and the NUT charge is constrained to a very narrow range for a 10$^\circ$ viewing angle. I report that the possibility of having KTN naked singularities in Sgr A* is small, considering the uncertainties in the shadow size. |
| title | Sgr A* Shadow Study with KTN Space Time and Investigation of NUT Charge Existence |
| topic | General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2409.16591 |