Wigner-Weyl isomorphism for quantum mechanics on Lie groups

Details Wigner-Weyl isomorphism for quantum mechanics on Lie groups Wigner-Weyl isomorphism for quantum mechanics on Lie groups

2004-07-30

arxiv.org/abs/quant-ph/0407257v2

J.Math.Phys. 46 (2005) 012106

Physics

Quantum Physics

32 pages, Latex2e

Scientific paper

10.1063/1.1825078

The Wigner-Weyl isomorphism for quantum mechanics on a compact simple Lie group $G$ is developed in detail. Several New features are shown to arise which have no counterparts in the familiar Cartesian case. Notable among these is the notion of a `semiquantised phase space', a structure on which the Weyl symbols of operators turn out to be naturally defined and, figuratively speaking, located midway between the classical phase space $T^*G$ and the Hilbert space of square integrable functions on $G$. General expressions for the star product for Weyl symbols are presented and explicitly worked out for the angle-angular momentum case.

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