# Can the Alcubierre Drive be explained by Gravitoelectromagnetism? [closed]

Even though there is no experimental evidence, that the Alcubierre drive works. The Einstein field equations permit this solution. For Gravitoelectromagnetism there are hints and ongoing efforts to test those hypotheses. See the up to date wikipedia articles on the Alcubierre Drive and Gravitoelectromagnetism. But whether there will or won't be experimental evidence does not matter for my question. My question is: Are the approximate Gravitoelectromagnetism equations sufficient to explain the Alcubierre Drive?

## closed as unclear what you're asking by Rob Jeffries, Pranav Hosangadi, ACuriousMind♦, bobie, Kyle KanosJan 2 '15 at 15:02

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• If one could explain the Alcubierre Drive with the familiar looking Gravitoelectromagnetism equations, that would be awesome. One reason why that might not be the case, is that in electromagnetism there does not exist, to my knowledge any similar concept. All of this is highly speculative, because at least for the Alcubierre Drive there is no experimental evidence so far. – v217 Jan 2 '15 at 10:38
• Like I said, it doesn't matter which theory you use to break momentum conservation in. It's plain false in all of them. – CuriousOne Jan 2 '15 at 10:42
• @CuriousOne the conservation of momentum follows from translation invariance. If you break translation invariance, conservation of momentum goes too. Isn't that exactly what the Alcubierre drive is doing by deforming spacetime? – John Dvorak Jan 2 '15 at 11:13
• GR without gravitational waves is completely identical to Newtonian gravity in the far field, so the internal structure of the bubble shouldn't play any role for an observer who is far enough away. Such an observer can measure the center of mass of any volume of space the bubble moves in. If the bubble moves real mass, the center of mass has to move (at any velocity!). That, of course, can not happen unless momentum conservation is violated or unless the drive produces e.g gravitational waves to make up for that... but those can only travel at c! – CuriousOne Jan 2 '15 at 11:22