Spinning Black Holes in Shift-Symmetric Horndeski Theory
Presenting author: Jorge Delgado
Stationary, axially symmetric, asymptotically flat spinning black holes (BHs) in Shift Symmetric Horndeski (SSH) theory are constructed and studied. These are both constructed numerically by solving the full system of field equations, as well as analytically by using a perturbation approach in the small coupling constant and spin regime. About the former, we present an overview of the parameter space of the solutions together with a study of their physical properties and phenomenology. Amongst other salient features, for enough fast-rotating SSH BHs, their angular frequency at the innermost stable circular orbit and light ring can be lower than one for Kerr. About the latter, a perturbative approach was made for static and rotating solutions, as well as a study about extremal solutions. We point out that there is a very good agreement between the numerical results and perturbation theory for the static case. Also, we show that extremal solutions are singular with thescalar field diverging on the horizon.
Oral presentation: yes. Poster: no.