The cosmic trimmer: Black-hole hair in scalar-Gauss-Bonnet gravity is altered by cosmology
arXiv:2403.15537 · doi:10.1103/PhysRevD.111.L041502
Abstract
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.
arXiv comment6 pages. Published version
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