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Observational signatures from horizonless black shells imitating rotating black holes
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
2018 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 7, article id 070Article in journal (Refereed) Published
Abstract [en]

In arXiv:1705.10172 it was proposed that string theory replaces Schwarzschild black holes with horizonless thin shells with an AdS interior. In this paper we extend the analysis to slowly rotating black holes, solving the Israel-Lanczos-Sen junction conditions for a rotating shell composed of stringy matter to determine the metric. Outside of the shell we find a vacuum solution that differs from Kerr with a 32% larger quadrupole moment. We discuss the observational consequences and explore the possibility to distinguish between a black shell and a black hole. Promising methods include imaging of the black hole at the center of the Milky Way using the Event Horizon Telescope, precision measurements of stars in close orbits around the central black hole, and future observations of colliding super massive black holes using the space based gravitational wave observatory LISA.

Place, publisher, year, edition, pages
SPRINGER , 2018. no 7, article id 070
Keywords [en]
Black Holes, Black Holes in String Theory, Classical Theories of Gravity
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-361272DOI: 10.1007/JHEP07(2018)070ISI: 000438141900008OAI: oai:DiVA.org:uu-361272DiVA, id: diva2:1253659
Funder
Swedish Research CouncilAvailable from: 2018-10-05 Created: 2018-10-05 Last updated: 2018-10-05Bibliographically approved

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Danielsson, Ulf H.Giri, Suvendu

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