Lensing of space time around a black hole. At Oxford we study black holes observationally and theoretically on all size and time scales - it is some of our core work. Credit: ALAIN RIAZUELO, IAP/UPMC/CNRS. CLICK HERE TO VIEW MORE IMAGES. Joseph SilkEmeritus Savilian Professor Sub departmentAstrophysics Research groupsBeecroft Institute for Particle Astrophysics and Cosmology joseph.silk@physics.ox.ac.uk Telephone: 01865 (2)73300 Denys Wilkinson Building, room 532G About Publications