Photon ring structure of rotating regular black holes and no-horizon spacetimes
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DOI: 10.1088/1361-6382/abdd48
Abstract: The Kerr black holes possess a photon region with prograde and retrograde orbits radii, respectively, M⩽rp−⩽3M and 3M⩽rp+⩽4M , and thereby always cast a closed photon ring or a shadow silhouette for a ⩽ M.… read more here.
Keywords: black holes; closed photon; photon ring; horizon spacetimes ... See more keywords