Krasnikov tube
Speculative mechanism for achieving faster-than-light travel / From Wikipedia, the free encyclopedia
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A Krasnikov tube[1] is a speculative mechanism for space travel involving the warping of spacetime into permanent superluminal tunnels. The resulting structure is analogous to a wormhole or an immobile Alcubierre drive (and like them requires exotic matter with negative energy density) with the endpoints displaced in time as well as space. The idea was proposed by Sergey Krasnikov in 1995.[2]