Black holes in scalar multipolar Universes

Carlos A. R. Herdeiro

Black holes in scalar multipolar Universes

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arxiv 2410.12950 v2 pith:WK2HXG2B submitted 2024-10-16 gr-qc hep-th

Carlos A. R. Herdeiro This is my paper · ORCID

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keywords scalarconstructionharmonicsolutionsblackcounterpartgeneralizedmultipolar

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abstract

Recently, a scalar counterpart of the Schwarzschild-Melvin Universe was reported [arXiv:2410.02851]. We show this solution is a special case of a Schwarzschild black hole/mass in a scalar multipolar Universe, that can be constructed algebraically combining known vacuum solutions. This builds on the generalized Weyl construction for scalar-vacuum, that admits two, fully decoupled, independent harmonic functions: one for the gravitational sector and another for the scalar sector. Harmonic solutions with growing multipoles lead to naked singularities (at spatial infinity), including for the scalar counterpart of the Schwarzschild-Melvin; harmonic solutions with decaying (scalar) multipoles are asymptotically flat, but have a singular horizon, in accordance with no-scalar-hair theorems. The scalar-vacuum model can be mapped to a five dimensional pure gravity construction via Kaluza-Klein oxidization and, in this way, to the corresponding $D=5$ generalized Weyl construction.

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