A combinatorial realization of Schur-Weyl duality via crystal graphs and dual equivalence graphs

Details A combinatorial realization of Schur-Weyl duality via crystal graphs and dual equivalence graphs A combinatorial realization of Schur-Weyl duality via crystal graphs and dual equivalence graphs

2008-04-10

arxiv.org/abs/0804.1587v1

Mathematics

Combinatorics

9 pages, 6 figures To appear in DMTCS as part of the FPSAC 2008 conference proceedings

Scientific paper

For any polynomial representation of the special linear group, the nodes of the corresponding crystal may be indexed by semi-standard Young tableaux. Under certain conditions, the standard Young tableaux occur, and do so with weight 0. Standard Young tableaux also parametrize the vertices of dual equivalence graphs. Motivated by the underlying representation theory, in this paper, we explainthis connection by giving a combinatorial manifestation of Schur-Weyl duality. In particular, we put a dual equivalence graph structure on the 0-weight space of certain crystal graphs, producing edges combinatorially from the crystal edges. The construction can be expressed in terms of the local characterizations given by Stembridge for crystal graphs and the author for dual equivalence graphs.

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