Distance-regular graphs and the $q$-tetrahedron algebra

Details Distance-regular graphs and the $q$-tetrahedron algebra Distance-regular graphs and the $q$-tetrahedron algebra

2006-08-28

arxiv.org/abs/math/0608694v1

Mathematics

Combinatorics

22 pages

Scientific paper

Let $\Gamma$ denote a distance-regular graph with classical parameters $(D,b,\alpha,\beta)$ and $b\not=1$, $\alpha=b-1$. The condition on $\alpha$ implies that $\Gamma$ is formally self-dual. For $b=q^2$ we use the adjacency matrix and dual adjacency matrix to obtain an action of the $q$-tetrahedron algebra $\boxtimes_q$ on the standard module of $\Gamma$. We describe four algebra homomorphisms into $\boxtimes_q$ from the quantum affine algebra $U_q({\hat{\mathfrak{sl}}_2})$; using these we pull back the above $\boxtimes_q$-action to obtain four actions of $U_q({\hat{\mathfrak{sl}}_2})$ on the standard module of $\Gamma$.

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