Difficulties
Significant problems with the metric of this form stem from the fact that all known warp drive spacetimes violate various energy conditions. It is true that certain experimentally verified quantum phenomena, such as the Casimir effect, when described in the context of the quantum field theories, lead to stress–energy tensors that also violate the energy conditions, such as negative mass-energy, and thus one can hope that Alcubierre-type warp drives can be physically realized by clever engineering taking advantage of such quantum effects.
Read more about this topic: Alcubierre Drive
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—Eric Hoffer (1902–1983)
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—Jane Addams (1860–1935)
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—Ivan Sergeevich Turgenev (1818–1883)