The physical Church-Turing thesis is... (“almost true” means you believe in rare/edge case exceptions such as, perhaps, hypercomputation).
If that worked, the CTT would be false for the classical universe, because the black hole would demonstrate hypercomputation. QM implies that the CTT is false for the classical universe, but not in general. According to QM, our classical universe is inefficiently implemented.
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I do not endorse hypercomputation (I agree with Martin Davis’ take on this.)
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