期刊
CLASSICAL AND QUANTUM GRAVITY
卷 17, 期 1, 页码 123-144出版社
IOP PUBLISHING LTD
DOI: 10.1088/0264-9381/17/1/309
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The apparent shapes of various Kerr-Newman spacetimes are plotted. For this purpose the geometry of closed photon orbits is studied, forming a subset of the bifurcation set A(4), well known in elementary catastrophe theory. One additional result is that the cosmic censorship hypothesis guarantees that the spacetime casts a shadow, whereas naked ring singularities enable the visibility of the 'anti-world' of negative radii r through its interior Moreover, the optical restrictions to the observability of the shadow of an astronomical black hole are inferred.
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