Black-hole hair in scalar-Gauss-Bonnet gravity is altered by cosmology
Static black holes in general relativity modified by a linear scalar coupling to the Gauss-Bonnet invariant always carry hair. We show that the same mechanism that creates the hair makes it incompatible with a cosmological horizon. Other scalar-tensor models do not have this problem when time dependence of the scalar provides a natural matching to cosmology. Scalar-Gauss-Bonnet gravity is particularly rigid, and such a scenario does not help. An extra operator makes the theory behave like the other models, and the cosmological horizon can be accommodated. The hair, however, is drastically altered.
Authors
- Ignacy Sawicki (ORCID: https://orcid.org/0000-0003-2476-9730)
- Leonardo G. Trombetta (ORCID: https://orcid.org/0000-0001-7345-5100)
- Eugeny Babichev (ORCID: https://orcid.org/0000-0003-4932-587X)
Institutions
- Czech Academy of Sciences (CZ)
- Université Paris-Saclay (FR)
- FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ)
- Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR)
Publication Details
- Journal
- Physical review. D/Physical review. D.
- Published
- 2025-02-13
- DOI
- https://doi.org/10.1103/physrevd.111.l041502
- Citations
- 4
- Primary Topic
- Cosmology and Gravitation Theories
- Type
- article
- Field-Weighted Citation Impact
- 4.62
Funders
- European Commission
- Agence Nationale de la Recherche
- Grantová Agentura České Republiky