Black hole minimum size and scalar charge in shift-symmetric theories

Farid Thaalba; Georgios Antoniou; Thomas P. Sotiriou

Black hole minimum size and scalar charge in shift-symmetric theories

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arxiv 2211.05099 v2 pith:SDRNMUAL submitted 2022-11-09 gr-qc hep-th

Farid Thaalba , Georgios Antoniou , Thomas P. Sotiriou This is my paper

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keywords blackchargecouplingholemassminimumscalarshift-symmetric

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It is known that, for shift-symmetric scalars, only a linear coupling with the Gauss-Bonnet invariant can introduce black hole hair. Such hairy black holes have a minimum mass, determined by the coupling of this interaction, and a scalar charge that is uniquely determined by their mass and spin for a fixed value of that coupling. Here we explore how additional shift-symmetric interactions affect the structure of the black hole, the value of the minimum mass, and the scalar charge.

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Supermassive black hole scalarization and effective field theory
gr-qc 2025-06 accept novelty 6.0 of 10

A canonical two-scalar EFT cannot naturally produce supermassive-only black hole scalarization, because the generated G^2 term has the wrong sign and is suppressed.

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