It is often said that low energy/effective physical laws (i.e fundamental physical constants) could possibly change if a quantum false vacuum decays into a true (stable) level of quantum vacuum.
But, could truly fundamental principles change? Could we have an extremely large transition of quantum vacuum levels that would cause fundamentally different (high-energy) laws and principles to appear?
PS: I found a paper that says
(...) This bubble will grow until at some point another bubble nucleates within it, or another bubble nucleates somewhere in the parent universe. This process will go on, and since there will be no limit to the size of the original universe, it can grow indefinitely, probably harbouring an infinite number of smaller pocket universes. The boundaries between these pockets will consist of domain walls, where the vacuum takes on intermediate values between the parents and the daughters value. Passing such a domain wall would be impossible for an observer, since it would have to travel to a universe with completely different laws of physics, making observing or even existing impossible
I'm not sure if it is referring to a radical change of fundamental laws and principles of nature