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
复制标题
DOI：
10.1088/0264-9381/17/1/309
复制
发表时间：
2000
影响因子：
3.5
通讯作者：
A de Vries
中科院分区：
文献类型：
--
作者：
A de Vries
绘制了各种克尔-纽曼时空的表观形状。为此，研究了闭合光子轨道的几何形状，形成了基本突变理论中众所周知的分岔集 A 4 的子集。另一个结果是，宇宙审查假说保证时空投射阴影，而裸环奇点使得负半径 r 的“反世界”通过其内部可见。此外，还推断了天文黑洞阴影可观测性的光学限制。
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.