Strichartz estimates on Schwarzschild black hole backgrounds
  We study dispersive properties for the wave equation in the Schwarzschild space-time. The first result we obtain is a local energy estimate. This is then used, following the spirit of earlier work of Metcalfe-Tataru, in order to establish global-in-time Strichartz estimates. A considerable part of the paper is devoted to a precise analysis of solutions near the trapping region, namely the photon sphere. 
Jeremy Marzuola, Jason Metcalfe, Daniel Tataru and Mihai Tohaneanu