X-ray interferometry

Space-based X-ray interferometry would improve current X-ray image resolution by more than four orders of magnitude, to enable imaging of nearby stellar coronae, binary systems in our galaxy, and horizon-scales of the nearest supermassive black holes, with only a single meters-scale spacecraft. Imaging capabilities are essentially unlimited if a formation-flying interferometer can be achieved. The technology to build such instruments is relatively undeveloped and has been recommended for inclusion in ESA's Voyage 2050 technology programme. In this talk, I will outline the key technologies, challenges and discovery potential of a range of X-ray interferometry missions, from an astrometric pathfinder to a full imager.