1) It is a play on words. It has a literal meaning (referring to the creation of gravitational waves), but "make waves" is also an idiomatic expression meaning to make a big stir or disturbance, referring here, I suppose, to the importance of the potential scientific discoveries. I don't know if it's the same in your language, but in English headline writers just love to make these little wordplays.
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NL888A question is still left there: what thought to have perturbed space-time in the early Universe?'relic gravitational waves' or just "(general) gravitational waves"? Can you see from the grammatical structure there?Just from the English, it reads as if relic gravitational waves perturbed space-time in the early Universe. Whether this is actually what was