天体物理黑洞能有拓扑非平凡的事件视界吗？
Can an astrophysical black hole have a topologically non-trivial event horizon?
摘要：
在四维广义相对论中，有几个定理限制了黑洞的事件视界的拓扑。在静止的情况下，黑洞必须有一个球形视界，而环形空间拓扑只在很短的时间内是允许的。在本文中，我们考虑旋转黑洞的启发圈量子引力和替代理论的重力。我们表明，这些对象的事件视界的空间拓扑结构的变化时，自旋参数超过一个临界值，我们认为，这种现象可能是很常见的非克尔黑洞。这种可能性可能与天体物理学有关，因为在某些模型中，吸积过程可以引起视界的拓扑转变。
英文摘要：
In 4-dimensional General Relativity, there are several theorems restricting the topology of the event horizon of a black hole. In the stationary case, black holes must have a spherical horizon, while a toroidal spatial topology is allowed only for a short time. In this paper, we consider spinning black holes inspired by Loop Quantum Gravity and by alternative theories of gravity. We show that the spatial topology of the event horizon of these objects changes when the spin parameter exceeds a critical value and we argue that the phenomenon may be quite common for non-Kerr black holes. Such a possibility may be relevant in astrophysics, as in some models the accretion process can induce the topology transition of the horizon.
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