> You're describing a time evolution _of the subsystems_
In my head I'm thinking about the time evolution of the global state, but examining the reduced state over certain subsystems at specific points in time.
> Split != superposition. Frequently, splitting in MWI is identified with decoherence
Decoherence is a superposition effect, is it not? Entanglement with the environment, i.e. a superposition of system-environment states.
> then you'd really mean, when you referred to the splitting of "an object" or "a system", that Universal splitting had occurred in such a way as to cause the object to exist in some particular multiple new branches
Yes, this is what I mean.
> What can a discussion on propagating splitting illuminate here?
Tbh I think it's unlikely that the parent is still following but I'm continuing for the selfish purpose of trying to better understand your point. That said, I believe that considering my toy example of a global quantum state in one dimension would illuminate their question about superpositions propagating from here and alpha centauri and meeting in the middle.
In my head I'm thinking about the time evolution of the global state, but examining the reduced state over certain subsystems at specific points in time.
> Split != superposition. Frequently, splitting in MWI is identified with decoherence
Decoherence is a superposition effect, is it not? Entanglement with the environment, i.e. a superposition of system-environment states.
> then you'd really mean, when you referred to the splitting of "an object" or "a system", that Universal splitting had occurred in such a way as to cause the object to exist in some particular multiple new branches
Yes, this is what I mean.
> What can a discussion on propagating splitting illuminate here?
Tbh I think it's unlikely that the parent is still following but I'm continuing for the selfish purpose of trying to better understand your point. That said, I believe that considering my toy example of a global quantum state in one dimension would illuminate their question about superpositions propagating from here and alpha centauri and meeting in the middle.