pood
Contributor
- Joined
- Oct 25, 2021
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- Basic Beliefs
- agnostic
That's not what I asked: WHAT determines which of the many worlds is the present? Or is the past as unfixed as the future?Many-worlds IS indeterministic: what determines which of the many is the present?Only if you assume many-worlds interpretations, which are not provable, any more than Superdeterminism is disprovable.Well, except … quantum mechanics involves non-locality.I'm saying that subjective experience IS localness.what is it about having the property of localness that necessitates or explains subjective experience
The thing is... Physics doesn't explain why local realism in the first place. It's literally one of the assumptions physics itself is based on, just the rule "things happen in places" means "the report of a thing happening in a place will be attached to a place about which it happens, even if the thing in the place is "this thing in the place "five seconds ago"".
Asking why beyond that is like asking why does the universe exist; it just does, regardless of how or why.
Regardless of how or why, locality is a thing, and the mind as we understand it is a product of that.
From this perspective that mind is the product of interactions having "localness", though, you can imagine how ridiculous I think proposing a non-local mind would be; that which doesn't localize cannot be a mind in the first place since localization creates minds.
That is not correct. The many worlds interpretation eliminates non-locality, as well as indeterminism and anti-realism.
It’s not indeterministic, and it’s not non-local.
Standard quantum mechanics is indeterministic, antirealist and nonlocal. It is indeterministic because the outcome of events is not fixed prior to the event but can only be probabilistically calculated using the Born rule. It is antirealist because some presumed measurement or observation is needed to bestow properties on “external” objects. This occurs from wave-function collapse. It is nonlocal because two entangled particles can be separated by enormous distances, even on opposite sides of the universe, yet collapsing the wave function for one instantaneously collapses the wave function for the other and dictates its observed properties.
All this goes away under Many Worlds, because on this meta-theory there is no wave function collapse. There is a universal wave function that evolves deterministically and encodes every possible outcome. Under MWI, the Born rule is used to calculate the probability that “I” will find myself in a particular branch of the quantum multiverse, but in a sense “I” am in all of them, raising serious issues in the philosophy of personal identity.
It is realist because it does away with idea of an observer or a measurement needed to collapse the wave function into a particular outcome, since there is no wave function collapse.
It is local because there is no instantaneous wave function collapse that can somehow reach across the universe — because, again, there is no wavefunction collapse at all. The particular outcomes of quantum entanglement experiments that appear to be nonlocal results from the fact that there is a Born probability of zero that would yield outcomes different from what is observed.
However, there is still a sort of nonlocality in that “world” remains a nonlocal concept.
One motivating factor to accept Many Worlds is because it restores the reality that Einstein preferred — determined, real (mind-independent) and causally local. However, just because we might prefer the universe to behave classically, doesn’t mean that it has to. For me, the Many Worlds makes more sense, and is more parsimonious, because it does away with a wave-function collapse that otherwise is completely mysterious and unexplained. The pioneers of QM were well aware that they were putting the collapse postulate in ad hoc to explain why we see only one outcome instead of a multiplicity. Hugh Everett in 1957 then explained we see only “one” world because a version of us is quantum-entangled with it, while other versions of us are quantum-entangled with other versions. Although Everett worked this out formally, Schrödinger anticipated Many Worlds in 1952.
Kastrup dislikes Many Worlds, deeming it a “theoretical monstrosity,” though it’s hard to see why, exactly. I think it is because he thinks nonlocality, antirealism and indeterminism fit more nicely with idealism than with physicalism, but I think the main attraction of idealism is that, first, our only experiences are entirely phenomenal, and second, it dissolves the Hard Problem.
Some interpretations of QM do allow for and possibly entail the future acting on the past, but I don’t think MWI involves any of that.