标题： 黑洞和磁场 显示英文标题

标题： Black Holes and Magnetic Fields

摘要： 我们简要总结了代表在强轴对称磁场中旋转带电黑洞的时空的基本性质。 我们集中研究极端情况，其中视界表面引力消失。 我们通过寻找在退化视界附近表现出其几何结构的更简单的时空来研究它们的性质。 利用通过近视界极限描述得到的更简单几何结构，我们分析了极端黑洞排斥磁场的迈斯纳效应。 显示英文摘要

摘要： We briefly summarise the basic properties of spacetimes representing rotating, charged black holes in strong axisymmetric magnetic fields. We concentrate on extremal cases, for which the horizon surface gravity vanishes. We investigate their properties by finding simpler spacetimes that exhibit their geometries near degenerate horizons. Employing the simpler geometries obtained by near-horizon limiting description we analyse the Meissner effect of magnetic field expulsion from extremal black holes.