You’re actually somewhat mistaken in your view of many worlds. Many worlds can be seen as a kind of non-local theory, as the nature of the theory assumes a specific time line of “simultaneity” along which the universe can “split” at an instant.
But special relativity allows no one such objective simultaneous moment in time, and from the perspective of time lines at different angles, then the split could happen at different “spatial points” depending on their perspective. Thus, its split would not have one specific set of spacial locations unless one were to assume a privileged basis, which relativity denies. And if one were to assume such a privileged basis (which relativity denies), then some other basis would be forced to see a sort of faster then light communication as a moment that appears to be in the future would create at that moment a causal split to a different universe
Now, whether that’s non-local in the same way, maybe you can argue, but the main reason locality is important in physics is through its status as an axiom of relativity, and many worlds violates special relativity just as much as collapse does.
“Many worlds can be seen as a kind of non-local theory, as the nature of the theory assumes a specific time line of “simultaneity” along which the universe can “split” at an instant.”
As I understand, no it doesn’t. The universe split is also local, and if at a difference at point A preserves the same particles at point B, then at point B we only have the same universe (where at point A we have multiple). The configurations merge together. It’s more like vibration than splitting into paths that go into different directions. Macroscopic physics is inherently predictable, meaning that all the multiple worlds ultimately end up doing roughly the same thing!
Except for that one hypothetical universe where I saw a glass of boiling water spontaneously freeze into an ice block.
I’m going to guess the fact I’m not in that universe and as far as we know no-one has ever been, has something to do with the Born probabilities.
As far as ethical implications go, the vibration visualization helps me sort it out. The other existing me’s are not more ethically distinct from each other than ‘me a second ago’ is ethically distinct from ‘me a second later’. They are literally the same person, me. Any other me would do the same thing this me is doing, because there’s no reason for it to be otherwise (if quantum phenomena had random effects on macroscopic scale, the world would be a lot more random and a lot less predictable on the everyday level), so we’re still overlapping. All the uncountable other me’s are sitting in the same chair I am (also smeared/vibrating), typing the same words I am, and making typos and quickly backspacing to erase them on the same smeared/vibrating keyboard.
All of the smearing has absolutely no effect a lightyear away from me, because the year it would take for any effect from my vibration over here to get to there hasn’t passed yet. It has its own vibration, and I’m not affected by that one either.
You’re actually somewhat mistaken in your view of many worlds. Many worlds can be seen as a kind of non-local theory, as the nature of the theory assumes a specific time line of “simultaneity” along which the universe can “split” at an instant.
But special relativity allows no one such objective simultaneous moment in time, and from the perspective of time lines at different angles, then the split could happen at different “spatial points” depending on their perspective. Thus, its split would not have one specific set of spacial locations unless one were to assume a privileged basis, which relativity denies. And if one were to assume such a privileged basis (which relativity denies), then some other basis would be forced to see a sort of faster then light communication as a moment that appears to be in the future would create at that moment a causal split to a different universe
Now, whether that’s non-local in the same way, maybe you can argue, but the main reason locality is important in physics is through its status as an axiom of relativity, and many worlds violates special relativity just as much as collapse does.
“Many worlds can be seen as a kind of non-local theory, as the nature of the theory assumes a specific time line of “simultaneity” along which the universe can “split” at an instant.”
As I understand, no it doesn’t. The universe split is also local, and if at a difference at point A preserves the same particles at point B, then at point B we only have the same universe (where at point A we have multiple). The configurations merge together. It’s more like vibration than splitting into paths that go into different directions. Macroscopic physics is inherently predictable, meaning that all the multiple worlds ultimately end up doing roughly the same thing!
Except for that one hypothetical universe where I saw a glass of boiling water spontaneously freeze into an ice block.
I’m going to guess the fact I’m not in that universe and as far as we know no-one has ever been, has something to do with the Born probabilities.
As far as ethical implications go, the vibration visualization helps me sort it out. The other existing me’s are not more ethically distinct from each other than ‘me a second ago’ is ethically distinct from ‘me a second later’. They are literally the same person, me. Any other me would do the same thing this me is doing, because there’s no reason for it to be otherwise (if quantum phenomena had random effects on macroscopic scale, the world would be a lot more random and a lot less predictable on the everyday level), so we’re still overlapping. All the uncountable other me’s are sitting in the same chair I am (also smeared/vibrating), typing the same words I am, and making typos and quickly backspacing to erase them on the same smeared/vibrating keyboard.
All of the smearing has absolutely no effect a lightyear away from me, because the year it would take for any effect from my vibration over here to get to there hasn’t passed yet. It has its own vibration, and I’m not affected by that one either.
“Many worlds” but same universe.