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The cosmic trimmer: Black-hole hair in scalar-Gauss-Bonnet gravity is altered by cosmology (2403.15537v2)
Published 22 Mar 2024 in gr-qc and astro-ph.CO
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.
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