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Alan Weinstein studies the mathematical interface between classical mechanics and quantum mechanics, particularly symplectic geometry. His Berkeley research profile identifies this connection.^[ref]

With Sean Bates, he wrote Lectures on the Geometry of Quantization by Sean Bates and Alan Weinstein. Their treatment of half-densities explains how to integrate products of wave-like objects intrinsically: the product of two half-densities is a density, giving a coordinate-independent inner product and hence a Hilbert space. This is part of the geometric infrastructure needed to relate classical phase spaces to quantum states.^[ref]

Sean Bates coauthored Lectures on the Geometry of Quantization by Sean Bates and Alan Weinstein with Alan Weinstein. The manuscript's title page verifies the byline; its preface traces the notes to Weinstein's courses on symplectic geometry and geometric quantization.^[ref]

The lectures connect Hamiltonian mechanics on a symplectic manifold with unitary evolution on a Hilbert space. Their account of half-densities supplies an intrinsic way to define an inner product, avoiding dependence on a chosen coordinate volume element. The contribution is an exposition of the geometry linking the two mathematical descriptions of motion.^[ref]