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I happen to have a firm conviction that quantum mechanics is incorrect as a description of the actual universe regardless of its empirical accuracy.  On the other hand, it is probably a theory that is a correct approximate linear model.  Now geometric quantization is an approach to link classical to quantum mechanics.  In the axiomatic geometric quantization, functions $f\in C^{\infty}(M)$ are mapped to operators $\hat{f}$ satisfying some axioms: (a) linearity, (b) constant functions get mapped to constant times identity, (c) Poisson brackets map as $\{ f_1, f_2 \} = f_3$ go to $[\hat{f_1},\hat{f_2}] = -i\hbar \hat{f_3}$.  Now in geometric quantization on a line bundle $B\rightarrow \Simga$ for a symplectic $\Sigma$ with $\hat{f} s = -i\hbar\nabla_{X_f} s + f s$.  Let’s consider the physical space $M\i S^4(1/h)$ and $\Sigma = T^*M$ which is symplectic.  There’s a natural line bunlde for $M$ which is the normal bundle of the embedding, so we can get the geometric quantization ‘prequantum bundle’ here canonically.