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    Global hyperbolicity is a sufficient but not necessary co... — Carmelics
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    Challenges→The counterexample relies on solutions that are not globally hyperbolic, but Penrose and Hawking's singularity theorems suggest physically realistic spacetimes satisfy strong causality conditions.

    Global hyperbolicity is a sufficient but not necessary condition; weaker causality may hold in realistic scenarios near singularities.

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    The counterexample relies on solutions that are not globally hyperbolic, but Pen...

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