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No Scalar-Haired Cauchy Horizon Theorem in Einstein-Maxwell-Horndeski Theories

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arxiv 2101.10116 v3 pith:ZFAMO66X submitted 2021-01-25 hep-th gr-qc

classification hep-thgr-qc
keywords blacktheoremtheoriescauchyeinstein-maxwell-horndeskiholeholeshorizon
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Recently, a no inner (Cauchy) horizon theorem for static black holes with non-trivial scalar hairs has been proved in Einstein-Maxwell-scalar theories. In this paper, we extend the theorem to the static black holes in Einstein-Maxwell-Horndeski theories. We study the black hole interior geometry for some exact solutions and find that the spacetime has a (space-like) curvature singularity where the black hole mass gets an extremum and the Hawking temperature vanishes. We discuss further extensions of the theorem, including general Horndeski theories from disformal transformations.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Horizon-regular cross-focusing and inner-horizon obstructions in spherical f(R) gravity

    gr-qc 2026-08 accept novelty 6.0 of 10

    In spherical f(R) gravity, a regular outer horizon followed by an ingoing segment with mixed matter-scalaron source at or below F/r^2 cannot be followed by a second regular inner marginal horizon on the same generator.

  2. On static and rotating decoupled black holes without inner horizons

    gr-qc 2024-12 conditional novelty 4.0 of 10

    The authors construct a family of static and rotating black hole metrics with an extra 1/r^n hair that, for negative hair parameter, removes the Cauchy horizon and makes the central singularity spacelike.

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