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. Dr Lei LiuVisitor Sub departmentAstrophysics Research groupsExperimental radio cosmologyThe Square Kilometre Array (SKA) lei.liu@physics.ox.ac.uk Denys Wilkinson Building About