Generalized Black Holes in 3D Kerr-Schild Double Copy

Abstract

The double copy of the Coulomb solution in three dimensions is a non-vacuum solution that can be obtained through different matter couplings. It is the static black hole solution of Einstein-Maxwell theory or general relativity minimally coupled to a free scalar field (with one ghost sign in the action in both cases). We consider generalizations of these matter couplings by paying particular attention to the regularity of the static black solution on the gravity side and the corresponding single copy electric field in the gauge theory. We show that i) Einstein-Born-Infeld theory yields a singular double copy, which admits stable orbits for certain choices of parameters, with a regular single copy electric field. ii) Black hole solutions constructed in arXiv:2104.10172 by coupling to the scalar field exemplify mostly regular double copies with regular single copy electric fields and also admit stable orbits. Additionally, we use these solutions to investigate the connection between horizons on the gravity side and electric fields on the gauge theory side, which was previously observed in four dimensions.

arXiv comment14 pages + references; v2: introduction extended, sections 2 and 4 improved, change of notation in sections 3 and 4, typos corrected, version to appear in PRD

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Cited by in corpus (9)

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• Isometries and the double copy
• Regularized Weyl double copy
• A spinorial double copy for $\mathcal{N}=0$ supergravity
• On regular charged black holes in three dimensions
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• Regular AdS${}_3$ black holes from regularized Gauss-Bonnet coupling
• Weyl double copy in Lifshitz spacetimes