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The Alcubierre drive or Alcubierre metric (See: Metric tensor) is a speculative idea based on a solution of Einstein's field equations as proposed by Mexican theoretical physicist Miguel Alcubierre, by which a spacecraft could achieve faster-than-light travel if negative mass existed. Rather than exceeding the speed of light within its local frame of reference, a spacecraft would
traverse distances by contracting space in front of it and expanding space behind it, resulting in effective faster-than-light travel.
It is impossible for objects to actually accelerate to the speed of light within normal spacetime; instead, the space around an object would shift so that the object would arrive at its destination faster than light would in normal space.[1] The metric proposed by Alcubierre is mathematically valid in that it is consistent with the Einstein field equations. However, this does not necessarily mean that it is physically meaningful or that such a drive could be constructed. The proposed mechanism implies a negative energy density, and thus requires exotic matter. Although there has never been any evidence that such matter exists, some theoretical models (that depart from the Standard Model) require it to exist.
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