Witten's "Bubble of Nothing"

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I have been reading on string theory when I chanced upon this article.
arXiv:1408.5903

The idea was first proposed by Witten in 1982. It requires extra dimensions in string theory. The extra dimension will squeeze to 0 size and create a hole in space-time in its place. This hole will expand and inside the hole space-time extinguishes. The bubble will push everything it touches away at the speed of light and I guess that if it hit us we will be blasted to atoms.

This is different from the decay of the Higgs field as when the higgs field decays, space-time will still exist, just with drastically different laws of physics.

So if string theory, extra dimensions were true, is some mechanism needed to prevent it's formation because if not we should not exist at all.

As I said again it can only be possible if extra dimensions exist.
Am I understanding it correctly?
 
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