Could MWI create universes with fundamentally different physical laws?

[Michael Price]

Well in both Copenhagen and MWI the universe will each a point where each vacuum will physically exist in some bubble. MWI will simply have more copies at a given time.

but a copy will evolve stochastically in Copenhagen, deterministically in MWI, so equivalence of two copies at a later time is broken in Copenhagen..

 

[DarMM]

but a copy will evolve stochastically in Copenhagen, deterministically in MWI, so equivalence of two copies at a later time is broken in Copenhagen..

MWI and Copehagen will differ in how the space of states which are excitations of a given vacuum are explored. MWI will span more of each vacuum's state space.

However in relation to the thread title MWI does not have access to more physical laws than Copenhagen, each will obtain all sets of laws.