title: Black holes in scalar-tensor gravity.
abstract: Hawking has proven that black holes which are stationary as the end point of gravitational collapse in Brans-Dicke theory (without a potential) are no different than in general relativity. We extend this proof to the much more general class of scalar-tensor and f(R) gravity theories, without assuming any symmetries apart from stationarity.
authors.affiliation: SISSA-ISAS, Trieste, Italy.
authors.forename: Thomas P
authors.initials: TP
authors.lastname: Sotiriou
authors.forename: Valerio
authors.initials: V
authors.lastname: Faraoni