Space expansion, gravity waves, warp

Edi
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If gravity waves are supposed to propagate at c, how could the theoretical warp drive wave propagate at greater than c values?
I have heard and red and understand that space itself can expand (and warp? ) faster than c and, in fact, that will happen in the future when space in between galaxy's will be expanding faster than c and the galaxy's will disappear from our observable universe, but, in that case, why would gravity waves only propagate at c ?
 
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What "theoretical warp drive wave"? Can you give us a reference or link?
 
Sorry, but Star Trek is fiction.
 

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