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RE: Hunting gravitational waves with Virgo and LIGO
I agree that this was very comprehensible for high level physics. I’m still not 100 percent clear on how the interference is detected, but I think that’s beyond the scope of this post.
I may try to answer... ;)
To make it simple without entering into all glory details.
When something that does not correspond to any known background is seen, one checks whether it is also detected in the other detectors. If yes, we have a wave.