Boundary causality versus hyperbolicity for spherical black holes in Gauss-Bonnet gravity

Tomás Andrade, Elena Cáceres, Cynthia Keeler

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


We explore the constraints boundary causality places on the allowable Gauss-Bonnet gravitational couplings in asymptotically AdS spaces, specifically considering spherical black hole solutions. We additionally consider the hyperbolicity properties of these solutions, positing that hyperbolicity-violating solutions are sick solutions whose causality properties provide no information about the theory they reside in. For both signs of the Gauss-Bonnet coupling, spherical black holes violate boundary causality at smaller absolute values of the coupling than planar black holes do. For negative coupling, as we tune the Gauss-Bonnet coupling away from zero, both spherical and planar black holes violate hyperbolicity before they violate boundary causality. For positive coupling, the only hyperbolicity-respecting spherical black holes which violate boundary causality do not do so appreciably far from the planar bound. Consequently, eliminating hyperbolicity-violating solutions means the bound on Gauss-Bonnet couplings from the boundary causality of spherical black holes is no tighter than that from planar black holes.

Original languageEnglish (US)
Article number135003
JournalClassical and Quantum Gravity
Issue number13
StatePublished - Jun 5 2017
Externally publishedYes


  • Gauss-Bonnet gravity
  • causality
  • higher curvature gravity
  • hyperbolicity

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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