标题： 黑洞成对生成并通过宇宙弦相连 显示英文标题

标题： Pair creation of black holes joined by cosmic strings

摘要： 我们认为，在磁场存在的情况下，带电黑洞成对产生并由宇宙弦连接的现象可以使用恩斯特度规进行分析。宇宙弦的作用是将黑洞彼此拉近，与背景场相反。利用欧几里得作用量对产生率的估算表明，与没有弦的黑洞形成过程相比，该过程受到抑制。 显示英文摘要

摘要： We argue that production of charged black hole pairs joined by a cosmic string in the presence of a magnetic field can be analyzed using the Ernst metric. The effect of the cosmic string is to pull the black holes towards each other, opposing to the background field. An estimation of the production rate using the Euclidean action shows that the process is suppressed as compared to the formation of black holes without strings.