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I mostly agree with this but I would like to emphasise that Bell's theorem emphatically doesn't tell you the universe isn't deterministic. It tells you there is
by eigenket 2y ago
I mostly agree with this but I would like to emphasise that Bell's theorem emphatically doesn't tell you the universe isn't deterministic. It tells you there isn't a local hidden variables model for it (under appropriate assumptions).
There are deterministic models which "escape" Bell's theorem's assumptions. In particular you can assume superdeterminism (which makes it very hard to do physics) or alternatively Everettian "many worlds" quantum mechanics is completely consistent with Bell's theorem.
- pilebunker7 2y agowhat do you mean by "makes it very hard to do physics"?
- eigenket 2y agoSuper determinism gets around the "problem" of Bell's inequality experiments by saying that the choices of experiment settings chosen by the experimenters are correlated with things we usually wouldn't expect them to be correlated with (like the system being measured). This makes it really hard to do physics because we usually assume you can choose to measure whatever the hell you want independent of the state of the system. Say we have some toy physical system which changes color reguarly, for 10 seconds it's red and for the next 10 seconds it's green and so on. We assume that we'll be able to gain physical understanding of such thing by measuring it whenever we like, but in a superdeterministic universe our choice to do the experiment can be correlated with the system, so we might be "forced" to only measure it when it happens to be red. We'll only ever see it be red and we will end up framing an incorrect "law of physics" that says the thing is red.