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Lorentzian traversable wormholes would permit travel in both instructions from one part of the universe to another part of that exact same universe really rapidly or would allow travel from one universe to another. The possibility of traversable wormholes in basic relativity was very first demonstrated in a 1973 paper by Homer Ellis and individually in a 1973 paper by K.
Bronnikov. Ellis examined the geography and the geodesics of the Ellis drainhole, revealing it to be geodesically complete, horizonless, singularity-free, and completely traversable in both instructions. The drainhole is a service manifold of Einstein's field equations for a vacuum spacetime, modified by inclusion of a scalar field minimally combined to the Ricci tensor with antiorthodox polarity (negative instead of favorable).
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When m is set equivalent to 0, the drainhole's gravitational field vanishes. What is left is the Ellis wormhole, a nongravitating, purely geometric, traversable wormhole. Kip Thorne and his college student Mike Morris, unaware of the 1973 documents by Ellis and Bronnikov, made, and in 1988 published, a duplicate of the Ellis wormhole for usage as a tool for teaching basic relativity.
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Later, other types of traversable wormholes were discovered as permitted solutions to the formulas of basic relativity, including a variety evaluated in a 1989 paper by Matt Visser, in which a course through the wormhole can be made where the passing through course does not travel through an area of exotic matter.
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A type held open by negative mass cosmic strings was put forth by Visser in collaboration with Cramer et al., in which it was proposed that such wormholes might have been naturally created in the early universe. Wormholes link two points in spacetime, which suggests that they would in concept allow travel in time, along with in space.
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