The apparent shape of a rotating charged black hole, closed photon orbits and the bifurcation set A4

Details The apparent shape of a rotating charged black hole, closed photon orbits and the bifurcation set A4 The apparent shape of a rotating charged black hole, closed photon orbits and the bifurcation set A4

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cqgra..17..123d&link_type=abstract

Classical and Quantum Gravity, Volume 17, Issue 1, pp. 123-144 (2000).

Astronomy and Astrophysics

Astrophysics

15

Scientific paper

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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