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relativity warp drive

Answer

The Alcubierre drive is a speculative warp drive idea that suggests a spacecraft could achieve apparent faster-than-light travel by contracting space
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The Alcubierre metric defines the warp-drive spacetime. It is a Lorentzian manifold that, if interpreted in the context of general relativity, allows a warp bubble to appear in previously flat spacetime and move away at effectively faster-than-light speed
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The interior of the bubble is an inertial reference frame and inhabitants experience no proper acceleration. However, the Alcubierre drive remains a hypothetical concept with seemingly difficult problems, though the amount of energy required is no longer thought to be unobtainably large
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According to writer Robert Low, within the context of general relativity, it is impossible to construct a warp drive in the absence of exotic matter
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In terms of a potential technology, warp drives “are greatly lacking,” according to Alcubierre and one of his colleagues
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There is no known way to actually accelerate a warp bubble, and all previous ideas about the subject simply assume that the curvature of spacetime is already moving at high speed
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However, the concept of a warp drive retains its fascination, especially for Trekkies and for a few gravitational physicists who occasionally publish variations on the idea
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The warp drive is a hyper-fast travel concept within general relativity that modifies spacetime in a way that allows a spaceship to travel with an arbitrarily large speed
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By a purely local expansion of spacetime behind the spaceship and an opposite contraction in front of it, motion faster than the speed of light is possible
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However, this would probably require either externally moving the warp generating mechanism at near lightspeed velocities or embedding one
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In summary, the warp drive is a speculative concept that suggests a spacecraft could achieve faster-than-light travel by contracting space. However, it remains a hypothetical concept with seemingly difficult problems, and there is no known way to actually accelerate a warp bubble.

Related

what is the Alcubierre metric and how does it relate to the warp drive concept
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