If that were true, MWI would have inter-world gravitational interactions. But it happens to be obviously wrong.
What do you mean by "obviously wrong"? Because it would be evidence against MWI? Maybe it is, I don't recall people trying to formalize it. Or maybe it limits the divergence of the worlds. Anyway, if it is not a good model, does this mean that we need a full QG theory to make MWI tenable?
This is a thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. The previous thread is at close to 500 comments.