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SquaredError comments on Stupid Questions September 2015 - Less Wrong
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Couldn't it still be just a local region that was temporarily squeezed as a result of an event on a much larger scale than the visible universe (sort of like a turbulence in a liquid like substance)?
It absolutely could be. But we've seen no evidence that distinguishes such a scenario from the big bang theory, and so we prefer it by Occam's razor.
There's a similar scenario for explaining Big Bang in string theory: the ekpyrotic universe.