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A broader term for any FTL communication method that manipulates spacetime itself—whether through warp bubbles, wormholes, or metric engineering—rather than using exotic quantum effects or extra dimensions. It presupposes the ability to create and control localized distortions of the metric, enabling signals to take shortcuts through spacetime. It faces the same theoretical challenges as warp drives, including potential causality violations, but proponents argue that a preserved causality hypothesis could resolve those paradoxes.
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