A model permitting λ-independence violations conflates epistemic inaccessibility of hidden variables with genuine causal influence, making the alleged 'signaling' explanatorily vacuous by Fine's criterion of causal relevance.
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A standard created by philosopher Arthur Fine for determining when something truly causes something else versus just being correlated with it; requires that a cause actually makes a difference to its effect.
Hidden variables(proposed as an alternative explanation for quantum phenomena)
Invisible information or properties that particles might secretly possess, which could explain quantum behavior without needing to change our current theories.
Signaling(what parameter dependence supposedly allows but outcome dependence doesn't)
Sending information from one place to another; in physics, this means one thing can transmit a message or influence to another thing.
λ-independence (lambda-independence)(as the concept being violated)
The idea that what we observe in an experiment shouldn't depend on hidden information or variables that existed before we started measuring; essentially, it means that hidden details shouldn't influence what we can actually detect.