With the advent of the first picture of a black hole taken by the Event Horizon Telescop collaboration we entered a new age of black hole research. In my talk I will ask,how much information an observer can hope to retrieve, at best, from such observations.
First I will introduce the concept of the shadow of a black hole and what it means for the shadows of two observers to be degenerate. I will then show that no continuous degenerations exist between the shadows of observers at any point in the exterior region of any Kerr‐Newman black hole spacetime of unit mass and hence all parameters can in principle be extracted from an observation.
Claudio Paganini (Potsdam): The Fingerprints of Black Holes‐ Shadows and their Degeneracies
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