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.
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.