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I recently heard about the possibility of the creation of a "baby" universe or "pocket" universe from our space time,the theory says that concentrating enough mass into a tiny volume of space (like in black holes) a pocket of false vacuum would form e perhaps it'll continue to expand following it's own inflation period and go on forever completly disconnected from our space time without influencing it any way. Now my question is : supposing that we live in a metastable vacuum we know that true vacuum bubble could form via quantum tunnelling and begin to expand into our space time where these false vacuum bubble (or pocket/baby universe) are supposed to go and expand ?

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The short and snarky answer is that it depends on your model. – Jerry Schirmer Sep 17 '13 at 15:18
@JerrySchirmer eternal inflation ? i think it's related in this article – user27494 Sep 17 '13 at 15:25

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