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The Cosmological Multiverse
The cosmological multi verse is the idea that we see an observable universe roughly tens of billions of light years across. The traditional thing in cosmology was to say, well, let's just guess that what happens outside is more or less a continuation of what happens inside. And then you get this idea that the universe is either flat, or positively curved or negatively curved. I think there are probably more kinds than this, but there's three ways in which these multiverse questions pop up in my work anyway.