#spacetime

Warp Drives, Alcubierre Metrics, and the Physics of Faster-Than-Light Travel

In 1994, physicist Miguel Alcubierre published a paper showing that general relativity does not, in principle, forbid faster-than-light travel — it just requires something that may not exist: exotic matter with negative energy density. The warp drive is real physics, and the story of whether it is possible is one of the strangest in science.