Universal interferometric signatures of a black hole's photon ring

Michael D. Johnson, Alexandru Lupsasca, Andrew Strominger, George N. Wong, Shahar Hadar, Daniel Kapec, Ramesh Narayan, Andrew Chael, Charles F. Gammie, Peter Galison, Daniel C.M. Palumbo, Sheperd S. Doeleman, Lindy Blackburn, Maciek Wielgus, Dominic W. Pesce, Joseph R. Farah, James M. Moran