Understanding geometrical phases in quantum mechanics: An elementary example [Book Review]

Foundations of Physics 23 (2):185-195 (1993)
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We discuss an exact solution to the simplest nontrivial example of a geometrical phase in quantum mechanics. By means of this example: (1) we elucidate the fundamental distinction between rays and vectors in describing quantum mechanical states; (2) we show that superposition of quantal states is invalid; only decomposition is allowed—which is adequate for the measurement process. Our example also shows that the origin of singularities in the analog vector potential is to be found in the unavoidable breaking of projective symmetry caused by using the Schrödinger equation



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State space as projective space. The case of massless particles.Luis J. Boya - 1989 - Foundations of Physics 19 (11):1363-1370.

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