论文标题
极端黑洞具有外部光环
Extremal black holes have external light rings
论文作者
论文摘要
事实证明，球体对称的外节末期黑洞至少具有一个外部光环。我们非常紧凑的证明是基于主要的能量条件，该能量条件表征了非武器极端黑洞空间中的外部物质场。
It is proved that spherically symmetric extermal black holes possess at least one external light ring. Our remarkably compact proof is based on the dominant energy condition which characterizes the external matter fields in the non-vacuum extremal black-hole spacetimes.
