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A specific branch of warp mechanics based on Miguel Alcubierre’s 1994 metric, which describes a spacetime “bubble” that contracts space in front of a vessel and expands it behind. Alcubierrian warp mechanics studies the properties of such bubbles: the required [negative energy] density, the horizon problem (no [communication] between inside and outside), the accumulation of Hawking radiation, and the feasibility of creating and controlling the bubble. It remains the most famous and most studied [mathematical] model for faster‑than‑light travel that respects general relativity (though it still requires exotic matter).
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