The standard formalism of quantum mechanics is one of the most successful theoretical constructions in the history of science. Its predictions have been confirmed to extraordinary precision. This paper explores a question it never asked --- and assumed closed without ever testing it. Bell's theorem rules out local hidden variables, and a continuously oscillating variable is no exception: sampled at the instant of measurement, it is still local. What the post-Bell consensus never tested is a different question --- whether quantum unpredictability could rest on a dynamic, deterministic substrate whose properties oscillate, with each measurement capturing a snapshot of that oscillation. In such a model, quantum outcomes are unpredictable --- as the result of a die throw is unpredictable --- without being indeterminate in the ontological sense claimed by the Copenhagen interpretation. Proposed We derive a falsifiable prediction: two successive weak measurements on a system governed by a dynamic hidden variable should exhibit a correlation function oscillating at frequency 2, where is the characteristic oscillation frequency of the hidden variable. Standard quantum mechanics predicts oscillation at with amplitude proportional to the measurement strength g. These two predictions are experimentally distinguishable with current technology at frequencies up to 10^15 Hz.
Daniel Avilés Hurtado (Tue,) studied this question.