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Dec 28, 2018 at 12:59 comment added Tobias Diez Have a look at Woodhouse: Geometric Quantization.
Dec 28, 2018 at 11:41 comment added Denis Nardin For (1), it's probably related to the fact that (isoclasses of) principal $S^1$-bundles are the same thing as line bundles and the same thing as classes in $H^2(M;\mathbb{Z})$ (since $BS^1\cong BO_1\cong K(\mathbb{Z},2)$), and deRham class of the curvature of a connection is exactly the image of the integral class in $H^2(M;\mathbb{R})$. This is standard material, treated for example in Milnor and Stasheff's book on characteristic classes.
Dec 28, 2018 at 11:32 history asked BrianT CC BY-SA 4.0