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I am a layman. I am aware that the Alcubierre Drive has not yet been proven to be possible, but there is something about the concept itself that I am confused about. If there is no movement within the bubble, how is time measured inside the bubble? If there is no velocity, what is time measured against?

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It's orthogonal to your question, but note that Alcubierre Drive's require an exotic form of matter (with negative energy density) unlike any we have evidence for existing. Such matter leads to other bizarre effects within the framework of general relativity, including some related to closed time-like curves. en.wikipedia.org/wiki/Alcubierre_drive –  Jess Riedel Jul 8 '13 at 18:14
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More on Alcubierre Drive: physics.stackexchange.com/search?q=is%3Aq+alcubierre –  Qmechanic Jul 8 '13 at 18:19
    
It may be unlikely to get a good answer, because this subject has many questions before. I would encourage you to edit your question, and in doing so, present your logical thought process to the best of your ability. The more specific, the more likely someone can offer quality information. –  AlanSE Jul 8 '13 at 21:44
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