I don’t think so. If it were classical, we would not be able to observe effects of double-slit experiments and so on.
And, also, there is no notion of “our branch” until one has traveled along it. At any given point in time, there are many branches ahead. Only looking back one can speak about one’s branch. But looking forward one can’t predict the branch one will end up in. One does not know the results of future “observations”/”measurements”. This is not what a classical universe looks like.
(Speaking of MWI, I recall David Deutsch’s “Fabric of Reality” very eloquently explaining effects from “neighboring branches”. The reason I am referencing this book is that this was the work particularly strongly associated with MWI back then. So I think we should be able to rely on his understanding of MWI.)
Something like, “for all branches, [...]”? That might be not that easy to prove or even to formulate. In any case, the linked proof has not even started to deal with this.
Something like, “there exist a branch such that [...]”? That might be quite tractable, but probably not enough for practical purposes.
“The probability that one ends up in a branch with such and such properties is no less than/no more than” [...]? Probably something like that, realistically speaking, but this still needs a lot of work, conceptual and mathematical...
No. I can only repeat my reference to Fabric of Reality as a good presentation of MWI and to remind that we do not live in a classical world, which is easy to confirm empirically.
And there are plenty of known macroscopic quantum effects already, and that list will only grow. Lasers are quantum, superfluidity and superconductivity are quantum, and so on.
I don’t think so. If it were classical, we would not be able to observe effects of double-slit experiments and so on.
And, also, there is no notion of “our branch” until one has traveled along it. At any given point in time, there are many branches ahead. Only looking back one can speak about one’s branch. But looking forward one can’t predict the branch one will end up in. One does not know the results of future “observations”/”measurements”. This is not what a classical universe looks like.
(Speaking of MWI, I recall David Deutsch’s “Fabric of Reality” very eloquently explaining effects from “neighboring branches”. The reason I am referencing this book is that this was the work particularly strongly associated with MWI back then. So I think we should be able to rely on his understanding of MWI.)
yes one can—all of them!
Yes, but then what do you want to prove?
Something like, “for all branches, [...]”? That might be not that easy to prove or even to formulate. In any case, the linked proof has not even started to deal with this.
Something like, “there exist a branch such that [...]”? That might be quite tractable, but probably not enough for practical purposes.
“The probability that one ends up in a branch with such and such properties is no less than/no more than” [...]? Probably something like that, realistically speaking, but this still needs a lot of work, conceptual and mathematical...
yes, but thanks to decoherence this generally doesn’t affect macroscopic variables. Branches are causally independent once they have split.
No. I can only repeat my reference to Fabric of Reality as a good presentation of MWI and to remind that we do not live in a classical world, which is easy to confirm empirically.
And there are plenty of known macroscopic quantum effects already, and that list will only grow. Lasers are quantum, superfluidity and superconductivity are quantum, and so on.