科研之友
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摘要
Usually, a black hole horizon hides singularities beyond it, being by itself perfectly regular. I discuss somewhat unusual cases when a system can combine regular and singular features due to the presence of the horizon. The first example is the so-called truly naked black holes when the Kretschmann scalar is finite but tidal forces diverge on the horizon in the free-falling frame. The second one is the so-called quasi-black holes (special kind of objects on the verge of forming the extremal black holes). Then, naked behavior can occur in the entire region beyond the quasi-horizon. Apart from this, there is another kind of singular behavior in this case due to the quasi-horizon. In particular, this concerns the simplest example with a charged massive shell, empty inside. The curvature inside is zero but the whole inner region becomes degenerate in the quasi-horizon limit.
- 出版日期2008-4-25
