Hyperbolicity in scalar-Gauss-Bonnet gravity: a gauge invariant study for spherical evolution
Hyperbolicity in scalar-Gauss-Bonnet gravity: a gauge invariant study for spherical evolution
We study spherical evolution in scalar-Gauss-Bonnet gravity with additional Ricci coupling and use the gauge-invariant approach of Ref.~\cite{Reall:2021voz} to track well-posedness. Our results show that loss of hyperbolicity when it occurs, is due to the behaviour of physical degrees of freedom. They provide further support to the idea that this …