Without a robust account of how quantum fluctuations survive decoherence to produce classically detectable divergence, the argument from QM uncertainty to macroscopic chaos remains speculative rather than established physics.
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Tiny, random changes in energy and particles that happen at the smallest scales of matter and are a basic feature of how the quantum world works.
Speculative vs. established physics(as used in philosophy of science)
Speculative means based on ideas that haven't been proven yet; established physics means theories that have been confirmed through experiments and evidence.
decoherence(Used to describe why macroscopic superpositions are not directly observed, and assessed here for whether it resolves the measurement problem.)
A quantum mechanical process in which differently localised states of a measuring apparatus couple to different states of the surrounding environment, entangling the composite system and suppressing interference between branches.