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Breaking black-hole uniqueness at supermassive scales

In general relativity (GR), all asymptotically flat, stationary and axisymmetric vacuum black holes are described by the Kerr solution. Beyond GR, there is a prevailing expectation that deviations from the Kerr solution increase with the horizon curvature. We challenge this expectation by showing th...

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Hauptverfasser: Eichhorn, Astrid (VerfasserIn) , Fernandes, Pedro Goncalo da Silva (VerfasserIn) , Held, Aaron (VerfasserIn) , Silva, Hector O. (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 14 May 2025
In: Classical and quantum gravity
Year: 2025, Jahrgang: 42, Heft: 10, Pages: ?
ISSN:1361-6382
DOI:10.1088/1361-6382/add3b6
Online-Zugang:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1088/1361-6382/add3b6
Verlag, lizenzpflichtig, Volltext: https://iopscience.iop.org/article/10.1088/1361-6382/add3b6
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Verfasserangaben:Astrid Eichhorn, Pedro G.S. Fernandes, Aaron Held and Hector O.Silva

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520 |a In general relativity (GR), all asymptotically flat, stationary and axisymmetric vacuum black holes are described by the Kerr solution. Beyond GR, there is a prevailing expectation that deviations from the Kerr solution increase with the horizon curvature. We challenge this expectation by showing that, in a scalar-Gauss-Bonnet theory, black holes scalarize in a finite, adjustable window of black-hole masses, bounded from above and below. In this theory, there is an interplay between curvature scales and compactness, which we expect to protect neutron stars and other less compact objects from scalarization. In addition, this theory is the first to avoid the catastrophic instability of early-Universe cosmology that affects previous scalarization models. In this theory, black-hole uniqueness can be broken at supermassive black-hole scales, while stellar-mass black holes remain well-described by the general relativistic solution. To probe this scenario, observations targeting supermassive black holes are necessary. 
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