Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2001-05-23
AIP Conf.Proc. 589 (2001) 181-203
Physics
High Energy Physics
High Energy Physics - Theory
24 pages, LaTeX. Lectures given at Karpacz winter school (February 2001). Minor misprints corrected. One appendix added
Scientific paper
10.1063/1.1419325
Representation theory, for the classical binary polyhedral groups is encoded by the affine Dynkin diagrams E6^{(1)}, E7^{(1)} and E8^{(1)} (McKay correspondance). The quantum versions of these classical geometries are associated with representation theories described by the usual Dynkin diagrams E6, E7 and E8. The purpose of these notes is to compare several chosen aspects of the classical and quantum geometries by using the study of spaces of paths and spaces of essential paths (Ocneanu theory) on these diagrams. To keep the size of this contribution small enough, most of our discussion will be limited to the cases of diagrams E6 and E6^{(1)}, i.e. to the quantum and classical tetrahedra. We shall in particular interpret the A11 labelling of the vertices of E6 diagram as a quantum analogue of the usual decomposition of spaces of sections for vector bundles above homogeneous spaces. We also show how to recover Klein invariants of polyhedra by paths algebra techniques and discuss their quantum generalizations.
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