Black holes in nonflat backgrounds: The Schwarzschild black hole in the Einstein universe - art. no. 024020

As an example of a black hole in a non-flat background a composite static s pacetime is constructed. It comprises a vacuum Schwarzschild spacetime for the interior of the block hole across whose horizon it is matched onto the spacetime of Vaidya representing a black hole in the background of the Eins tein universe. The scale length of the exterior sets a maximum to the black hole mass. To obtain a non-singular exterior, the Vaidya metric is matched to an Einstein universe. The behavior of scalar waves is studied in this c omposite model.