Spontaneous symmetry breaking is part of stat mech. It has practically nothing to do with QM. Stat mech can be interpreted probabilistically, but it is not at all controversial to apply it to deterministic systems.
"Spontaneous" means that something happens without precursor; without any apparent cause. It is orthogonal in meaning to "determined".
Maybe that's a reasonable definition, but you contrasted "spontaneous" with "closed," which is not orthogonal to "determined."
you contrasted "spontaneous" with "closed,"
My point was that true randomness of any kind would be evidence that a system is not closed. This might be a novel observation (I haven't heard it before) but I think it is a logical one. It is relevant to reductionism (we wouldn't want supernatural processes swooping down to make choices for our free processes) and whether we are in a simulation.
...Spontaneous symmetry breaking is part of stat mech. [...] Stat mech can be interpreted probabilistically, but it is not at all controversial to
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