期刊
JOURNAL OF HIGH ENERGY PHYSICS
卷 -, 期 4, 页码 -出版社
SPRINGER
DOI: 10.1007/JHEP04(2020)180
关键词
Black Holes; Classical Theories of Gravity
资金
- FCT [SFRH/BD/130784/2017]
- Center for Research and Development in Mathematics and Applications (CIDMA) through the Portuguese Foundation for Science and Technology (FCT | Fundacao para a Ciencia e a Tecnologia) [UIDB/04106/2020, UIDP/04106/2020]
- national funds (OE), through FCT, I.P.
- COST Action [CA16104]
- European Union's Horizon 2020 research and innovation (RISE) programme H2020MSCA-RISE-2017 [FunFiCO-777740]
- [PTDC/FISOUT/28407/2017]
- [CERN/FIS-PAR/0027/2019]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/130784/2017, CERN/FIS-PAR/0027/2019] Funding Source: FCT
We construct spinning black holes (BHs) in shift-symmetric Horndeski theory. This is an Einstein-scalar-Gauss-Bonnet model wherein the (real) scalar field couples linearly to the Gauss-Bonnet curvature squared combination. The BH solutions constructed are stationary, axially symmetric and asymptotically flat. They possess a non-trivial scalar field outside their regular event horizon; thus they have scalar hair. The scalar charge is not, however, an independent macroscopic degree of freedom. It is proportional to the Hawking temperature, as in the static limit, wherein the BHs reduce to the spherical solutions found by Sotirou and Zhou. The spinning BHs herein are found by solving non-perturbatively the field equations, numerically. We present an overview of the parameter space of the solutions together with a study of their basic geometric and phenomenological properties. These solutions are compared with the spinning BHs in the Einstein-dilaton-Gauss-Bonnet model and the Kerr BH of vacuum General Relativity. As for the former, and in contrast with the latter, there is a minimal BH size and small violations of the Kerr bound. Phenomenological differences with respect to either the former or the latter, however, are small for illustrative observables, being of the order of a few percent, at most.
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