一根针的头部能装下多少个黑洞？
How many black holes fit on the head of a pin?
摘要：
在弦论中，某些黑洞的贝肯斯坦-霍金熵可以在微观上计算，方法是把计算强引力黑洞微观态的难以捉摸的问题映射到计算弱耦合D膜系统微观态的容易处理的问题上。弱耦合D膜系统没有事件视界，实际上可以舒适地装在大头针头上。我们在这里表明，与广泛持有的信念相反，球对称黑洞的熵可以很容易地被相同总电荷和能量的静止多黑洞“分子”所矮化。因此，相应的针大小的D膜系统甚至不近似计算单个黑洞的微观态，而是计算一个动物园的熵占主导地位的多中心配置的微观态。
英文摘要：
The Bekenstein-Hawking entropy of certain black holes can be computed microscopically in string theory by mapping the elusive problem of counting microstates of a strongly gravitating black hole to the tractable problem of counting microstates of a weakly coupled D-brane system, which has no event horizon, and indeed comfortably fits on the head of a pin. We show here that, contrary to widely held beliefs, the entropy of spherically symmetric black holes can easily be dwarfed by that of stationary multi-black-hole ``molecules'' of the same total charge and energy. Thus, the corresponding pin-sized D-brane systems do not even approximately count the microstates of a single black hole, but rather those of a zoo of entropically dominant multicentered configurations.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
