> For one, the information content of the multiverse expands exponentially towards infinity. I don't agree. I would say that the biggest difference-- really, t

> For one, the information content of the multiverse expands exponentially towards infinity. I don't agree. I would say that the biggest difference-- really, the fundamental difference-- between Everett and Copenhagen is that Everett says that the state evolution of the wave function is always unitary, while Copenhagen says that it's only unitary sometimes but not others (and don't ask about how to calculate which way it will act). Under unitary state evolution the volume of phase space is preserved and no information is globally created or destroyed. So the "branching" picture of Everett is not precisely correct, though it is handy language for building intuition. This should not be surprising because of complementary observables-- confining the state of one property will cause some other property to become proportionally unconfined, per Heisenberg.