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Can anyone explain me what is the result of bubble universes collision according to eternal inflation in the case of two identical bubble universes with the same vacuum energy density (for example two universes like ours) and in the case of a collision between different bubble universes where the vacuum energy density is different (for example a true vacuum bubble colliding with a false vacuum bubble) ?
I just read this article http://arxiv.org/abs/1112.4487 but im looking for a less mathematical answer

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