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

被引：196

作者：

de Vries, A ^{[1
]}

机构：

[1] Ruhr Univ Bochum, Inst Math, D-44780 Bochum, Germany

来源：

CLASSICAL AND QUANTUM GRAVITY | 2000年 / 17卷 / 01期

关键词：

D O I：

10.1088/0264-9381/17/1/309

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：123 / 144

页数：22