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Is there a spacetime that contains traveling planar event horizons?

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  • $\begingroup$ The Alcubierre metric isn't planar, but it does have a type of horizon. It may be of interest. The standard plane-wave formalism when you're talking about gravitational waves is the pp-wave spacetime, but I don't believe there's any form of them that would lead to a horizon. $\endgroup$
    – Mike
    Jan 18, 2023 at 20:23

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