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We show that, away from the axis of symmetry, no continuous degeneration exists between the shadows of observers at any point in the exterior region of any Kerr-Newman black hole spacetime of unit mass.
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A. Grenzebach, V. Perlick, and C. Lämmerzahl, Photon regions and shadows of Kerr-Newman-NUT black holes with a cosmological constant , Physical Review D 89
2014
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Z. Li and C. Bambi, Measuring the Kerr spin parameter of regular black holes from their shadow , Journal of Cosmology and Astroparticle Physics 2014
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A. Grenzebach, V. Perlick, and C. Lämmerzahl, Photon regions and shadows of accelerated black holes , International Journal of Modern Physics D 24
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2008
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J. B. Griffiths and J. Podolskỳ, Exact space-times in Einstein’s general relativity , Cambridge University Press, 2009
2009
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K. Hioki and K. Maeda, Measurement of the Kerr spin parameter by observation of a compact object’s shadow , Physical Review D 80
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J. Schee and Z. Stuchlik, Optical phenomena in the field of braneworld Kerr black holes , International Journal of Modern Physics D 18
2009
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2015
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P. V. P. Cunha, C. A. R. Herdeiro, E. Radu, and H. F. Rúnarsson, Shadows of Kerr black holes with and without scalar hair , International Journal of Modern Physics D 25
2016
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C. F. Paganini and M. A. Oancea, Smoothness of the future and past trapped sets in Kerr-Newman-Taub-NUT spacetimes , In preparation (2017)
2017
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