Can a simply connected Lorentzian manifold admit an event horizon? Or does the event horizon makes it non-simply connected?
2026-03-25 21:49:31.1774475371
Simply-connected Lorentzian manifold and event horizon
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As aes said, the Schwarzschild solution is simply connected and admits an event horizon.
(Posting as CW for the sake of giving this question an answer.)