QDYBE: some explicit formulas for exchange matrix and related objects in case of sl(2), q=1

Details QDYBE: some explicit formulas for exchange matrix and related objects in case of sl(2), q=1 QDYBE: some explicit formulas for exchange matrix and related objects in case of sl(2), q=1

2000-07-14

arxiv.org/abs/math/0007086v1

Mathematics

Quantum Algebra

19 pages

Scientific paper

This mainly tutorial paper is intended as a somewhat larger example for parts of the theory exposed in the Lectures on the dynamical Yang-Baxter equations by P. Etingof and O. Schiffmann, math.QA/9908064. We explicitly compute the matrix entries of the intertwining operator, fusion matrix and exchange matrix associated to sl(2,R) for q=1. We also consider the weighted trace function and the dual Macdonald-Ruijsenaars equation for this particular case. As expected, the matrix entries of the exchange matrix turn out to be Racah polynomials. However, the road to their explicit formula via the fusion matrix is quick, and it also yields an interesting way to derive their orthogonality relations.

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