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Is it possible that a false vacuum bubble to nucleate into our universe rather than a true vacuum one ? If yes,it will expand at speed of light within our spacetime or what ?

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possible duplicate of How fast is a true vacuum bubble going to expand? –  John Rennie Nov 8 '13 at 17:52
@JohnRennie i was referring to a false vacuum bubble not a true vacuum one...maybe it's a stupid question but..the have the same behavior? –  user27494 Nov 8 '13 at 18:34

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