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1. Traversable Wormhole

   Linked via "Chronology Protection Conjecture"

   The introduction of traversability fundamentally alters the causal structure of spacetime. If one mouth of a traversable wormhole is subjected to relativistic motion (e.g., accelerated to near the speed of light and then returned) or placed near a strong gravitational field (such as a neutron star), time dilation causes a difference in the elapsed time between the two mouths. This temporal differential transforms the wormhole into a time machine (a closed timelike curve, or CTC).
   The theoretical impli…