Because objects within the bubble are not moving (locally) more quickly than light, the mathematical formulation of the Alcubierre metric is consistent with the conventional claims of the laws of relativity (namely, that an object with mass cannot attain or exceed the speed of light) and conventional relativistic effects such as time dilation would not apply as they would with conventional motion at near-light speeds. This method of transport does not involve objects in motion at faster-than-light speeds with respect to the contents of the warp bubble that is, a light beam within the warp bubble would still always move more quickly than the ship. The interior of the bubble is an inertial reference frame and inhabitants experience no proper acceleration. 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. The Alcubierre metric defines the warp-drive spacetime. The ship would then ride this wave inside a region of flat space, known as a warp bubble, and would not move within this bubble but instead be carried along as the region itself moves due to the actions of the drive. In 1994, Miguel Alcubierre proposed a method for changing the geometry of space by creating a wave that would cause the fabric of space ahead of a spacecraft to contract and the space behind it to expand.

6.6 Causality violation and semiclassical instability.

4 Connection to dark energy and dark matter.

Some physicists have presented arguments to suggest that a theory of quantum gravity (which would incorporate both theories) would eliminate those solutions in general relativity that allow for backward time travel ( see the chronology protection conjecture) and thus make the Alcubierre drive invalid. Р В РІР‚СњР В РІР‚С›nother possible issue is that, although the Alcubierre metric is consistent with Einstein's equations, general relativity does not incorporate quantum mechanics.

Some research has claimed that such a concept is possible with purely positive energy using 'soliton' waves. At the close of his original article, however, Alcubierre argued (following an argument developed by physicists analyzing traversable wormholes ) that the Casimir vacuum between parallel plates could fulfill the negative-energy requirement for the Alcubierre drive. If exotic matter with the correct properties cannot exist, then the drive cannot be constructed. The proposed mechanism of the Alcubierre drive implies a negative energy density and therefore requires exotic matter or manipulation of dark energy.

Р В РІР‚СњР В РІР‚С›lthough the metric proposed by Alcubierre is consistent with the Einstein field equations, construction of such a drive is not necessarily possible. Objects cannot accelerate to the speed of light within normal spacetime instead, the Alcubierre drive shifts space around an object so that the object would arrive at its destination more quickly than light would in normal space without breaking any physical laws. Rather than exceeding the speed of light within a local reference frame, a spacecraft would traverse distances by contracting space in front of it and expanding space behind it, resulting in effective faster-than-light travel. The Alcubierre drive, Alcubierre warp drive, or Alcubierre metric (referring to metric tensor), is a speculative warp drive idea based on a solution of Einstein's field equations in general relativity as proposed by theoretical physicist Miguel Alcubierre during his PhD study at the University of Wales, Cardiff, by which a spacecraft could achieve apparent faster-than-light travel if a configurable energy-density field lower than that of vacuum (that is, negative mass) could be created. Two-dimensional visualization of an Alcubierre drive, showing the opposing regions of expanding and contracting spacetime that displace the central region

Resolume 5 wave warp v sync problem