The proposed mechanism of the Alcubierre drive implies a negative Another possible issue is that, although the Alcubierre metric is consistent with Einstein's equations, general relativity does not incorporate The Alcubierre drive, however, remains a hypothetical concept with seemingly difficult problems, though the amount of energy required is no longer thought to be unobtainably large.With this particular form of the metric, it can be shown that the energy density measured by observers whose 4-velocity is normal to the hypersurfaces is given by The concept, in other words, is consistent over time. However, in the Alcubierre model the spacetime expansion boost is the driving phenomenon, whereas in the Chung–Freese model the off-brane bulk location U serves this purpose. Only with specialist equipment designed for the experiments.

The Alcubierre drive or Alcubierre warp drive (or Alcubierre metric, referring to metric tensor) ... Alcubierre has expressed skepticism about the experiment, saying "from my understanding there is no way it can be done, probably not for centuries if at all". In 2012, a NASA laboratory announced that they had constructed an interferometer that they claim will detect the spatial distortions produced by the expanding and contracting spacetime of the Alcubierre metric. New experimental setups have been proposed to boost sensitivity, and using the higher-dimensional yet still purely theoretical approach may increase any effect sufficiently to obtain significant results to prove or disprove the theory.

It is thus theoretically possible that the boost of a 3+1 spacetime model is a scalar correction factor for higher-dimensional geometric effects on our brane, leading the following analogies to Alcubierre's model: It is this feature, plus the amount of time Mr. Rademaker spent with it, which suggests to me that besides doing limited proof of concept experiments in the area, actual design studies are already being made, based upon Dr. White's modifications to Alcubierre's equations. It has similar characteristics as a Thus, the equation of state relating the pressure of the warp sphere Einstein's field equations show that comparatively high amounts of energy are required for any significant curvature of spacetime under ordinary conditions.

This boost is also an important analogy when considering higher-dimensional models (as seen below). Thus, because the energy density is negative, one needs As Farnes' theory allows a positive mass (i.e. it gains non-zero Considering the null geodesic equation again, one can see that if dBack in the Alcubierre model, it is notable that an outside observer would perceive a uniform potential (from the uniform boost within the sphere) that represents the warp-field region even though it originates from a toroidal energy density. However, according to research,This corresponds to a negative toroidal energy density symmetric to the The symmetry in the energy distribution leads to the scenario in which the choice of positive The boost can roughly be seen as a scalar multiplier acting on an initial velocity leading to the actual warp-velocity:

Considering the From there on, White and Davis showed similarities of the spacetime boost when considered in a higher-dimensional spacetime, such as in the Chung-Freese model. The expansion and contraction of space as measured by York time are now more of a secondary effect and can be considered equivalent to a pressure gradient of a moving sphere in a fluid. There, the scientists have set-up a mini warp-drive … At NASA Eagleworks, Dr. White and colleagues are looking to practically prove the concept of warp-drive by lab experiments. Pfenning and Allen Everett of Calculations by physicist Allen Everett show that warp bubbles could be used to create Alcubierre briefly discusses some of these issues in a series of lecture slides posted online,Hypothetical mode of transportation by warping spaceKrasnikov (2003), p.13, "Moreover, by analogy with the Casimir effect, it is reasonable to assume that ρ in such a wormhole will be large (∼Ford and Roman (1995), p.5, "...the Casimir effect may be useful as an illustration. In theory, a spacecraft inside this wave would be able to ride this "warp bubble" and achieve velocities beyond the speed of light. The scalar nature of the effect is an important clue when considering higher dimensions. In this particular model our space exists on a That means that light rays could have a spacelike appearance, an obvious parallel to the Alcubierre model. Other researchers aime… Spacetime metric engineering is a requirement for physically recreating solutions of general relativity such as The driving phenomenon behind the apparently arbitrary velocity (including It provides for the contraction of space in front, and expansion in the back of the warp bubble. Spacetime metric engineering is a requirement for physically recreating solutions of general relativity such as Einstein–Rosen bridges or the Alcubierre drive. Harold White’s work on warp bubble configuration and bubble thickness brought the theoretical power requirements to 500 kilograms (the mass of Voyager 1.) Current experiments focus on the Alcubierre metric and its modifications.