Has LIGO detected any gravity waves yet, or any hints of them? Is it just that LIGO is not sensitive enough or are we now entering disconfirmation territory? If we never detect gravity waves with any instrument, what will this mean for our understanding of Relativity and Quantum Gravity?
closed as too localized by Qmechanic♦, Manishearth♦, Emilio Pisanty, Waffle's Crazy Peanut Dec 19 '12 at 9:51
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LIGO hasn't detected any gravity waves, but its sensivity means it would only detect waves in favourable circumstances so the failure to detect anything isn't a great surprise. LIGO is currently undergoing an upgrade to Advanced LIGO, and if this also fails to detect anything people will be starting to worry.
A quick Google will find you lots of articles on the performance of LIGO and Advanced LIGO. Google with "site:arxiv.org" for the definitive articles, or this SciAm article is a good summary.
I'm not sure what would happen if gravity waves remain stubbornly undetectable. It would certainly cause some head scratching amongst general relativists. There is indirect evidence for gravity waves from binary pulsars, so I suspect the initial reaction would be that our ideas for detecting them are at fault rather than that gravity waves don't exist.