I wonder if some of that would apply to the idea of the multiverse, whichever version you want to use. There are people out there who argue that we already have multiverses because we each live in our own universe. Potentially, that's where it gets really interested to me. With gravitational waves, if there were other universes, other bubble universes colliding with ours, maybe they would leave a little ripple in the gravitational waves or some such thing. I'm sure there's papers out there on that, but I'm not across the literature.

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