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1. There is no retrocausality - https://en.wikipedia.org/wiki/Delayed-choice_quantum_eraser#Retrocausality https://en.wikipedia.org/wiki/Delayed-choice_quantum_

1. There is no retrocausality - https://en.wikipedia.org/wiki/Delayed-choice_quantum_eraser#Retrocausality https://en.wikipedia.org/wiki/Delayed-choice_quantum_eraser#... This is an often misunderstood effect and while it’s very weird, it (most probably) doesn’t break causality.

xwolfi 4y ago
There is no retrocausality exactly because there is time resolution: causality with sort itself out whatever the cost, is what the quantum erasure experiment showed.
- jlbbellefeuille 4y ago
  There is a series called “dystopia”on Amazon that demonstrates this in a roundabout way IMHO.
andreareina 4y ago
I like Sean Carroll's explanation: https://www.preposterousuniverse.com/blog/2019/09/21/the-notorious-delayed-choice-quantum-eraser/ https://www.preposterousuniverse.com/blog/2019/09/21/the-not...
- archibaldJ 4y ago
  So it basically reinforces the many-world interpretation, which makes perfect sense, and it’s the most mathematically minimal of all too. Resorting to some kimd of retro-causality mechanism really shows how many people are uncomfortable with many-worlds. And many-worlds (though likely only scratching the surface of reality) is pretty much in the vein of panpsychism as it mirors the branching-out biology does with life/consciousness. That’s what I call a tasty correspondence of the universe We need a new mathematical framework that goes beyond spacetime and amplituhedron https://en.m.wikipedia.org/wiki/Amplituhedron https://en.m.wikipedia.org/wiki/Amplituhedron (from which more re-interpretations can happen, especially ones that can encapsulate consciousness more than just “an observer” (or worst leading to absurdity like the quantum suicide experiment https://en.m.wikipedia.org/wiki/Quantum_suicide_and_immortality https://en.m.wikipedia.org/wiki/Quantum_suicide_and_immortal... which definitely played a role in affecting Hugh Everett’s self-abusive lifestyle leading to his very early death at 51, as well as the suicide of his young daughter > Everett's daughter, Elizabeth, died by suicide in 1996 (saying in her suicide note that she wished her ashes to be thrown out with the garbage so that she might "end up in the correct parallel universe to meet up w[ith] Daddy"), https://en.m.wikipedia.org/wiki/Hugh_Everett_III https://en.m.wikipedia.org/wiki/Hugh_Everett_III
drc500free 4y ago
Thanks for clarifying this! The best way I've been able to intuitively understand it is that all worlds are internally consistent and causal, but the observation that causes us to split away from some worlds can be after the fact. That doesn't make it possible to come up with a superposition of worlds that breaks causality. Is that correct(ish)?

xwolfi 4y ago

There is no retrocausality exactly because there is time resolution: causality with sort itself out whatever the cost, is what the quantum erasure experiment showed.

jlbbellefeuille 4y ago
There is a series called “dystopia”on Amazon that demonstrates this in a roundabout way IMHO.

andreareina 4y ago

I like Sean Carroll's explanation: https://www.preposterousuniverse.com/blog/2019/09/21/the-notorious-delayed-choice-quantum-eraser/ https://www.preposterousuniverse.com/blog/2019/09/21/the-not...

archibaldJ 4y ago
So it basically reinforces the many-world interpretation, which makes perfect sense, and it’s the most mathematically minimal of all too. Resorting to some kimd of retro-causality mechanism really shows how many people are uncomfortable with many-worlds. And many-worlds (though likely only scratching the surface of reality) is pretty much in the vein of panpsychism as it mirors the branching-out biology does with life/consciousness. That’s what I call a tasty correspondence of the universe We need a new mathematical framework that goes beyond spacetime and amplituhedron https://en.m.wikipedia.org/wiki/Amplituhedron https://en.m.wikipedia.org/wiki/Amplituhedron (from which more re-interpretations can happen, especially ones that can encapsulate consciousness more than just “an observer” (or worst leading to absurdity like the quantum suicide experiment https://en.m.wikipedia.org/wiki/Quantum_suicide_and_immortality https://en.m.wikipedia.org/wiki/Quantum_suicide_and_immortal... which definitely played a role in affecting Hugh Everett’s self-abusive lifestyle leading to his very early death at 51, as well as the suicide of his young daughter > Everett's daughter, Elizabeth, died by suicide in 1996 (saying in her suicide note that she wished her ashes to be thrown out with the garbage so that she might "end up in the correct parallel universe to meet up w[ith] Daddy"), https://en.m.wikipedia.org/wiki/Hugh_Everett_III https://en.m.wikipedia.org/wiki/Hugh_Everett_III

drc500free 4y ago

Thanks for clarifying this! The best way I've been able to intuitively understand it is that all worlds are internally consistent and causal, but the observation that causes us to split away from some worlds can be after the fact. That doesn't make it possible to come up with a superposition of worlds that breaks causality. Is that correct(ish)?