Cosimo Bambi (Fudan University, Shanghai, China)

Testing black holes using X-ray reflection spectroscopy

Einstein’s theory of general relativity has been extensively tested in weak gravitational fields, while the strong gravity regime is still largely unexplored. In this talk, I show how we can test the Kerr black hole hypothesis using X-ray reflection spectroscopy. I present our new reflection model RELXILL_NK and the constraints obtained so far from a few stellar-mass and supermassive black holes.