A combinatorial decomposition of higher level Fock spaces

Details A combinatorial decomposition of higher level Fock spaces A combinatorial decomposition of higher level Fock spaces

2012-02-13

arxiv.org/abs/1202.2668v1

Mathematics

Representation Theory

18 pages

Scientific paper

We give a simple characterization of the highest weight vertices in the crystal graph of the level l Fock spaces. This characterization is based on the notion of totally periodic symbols viewed as affine analogues of reverse lattice words classically used in the decomposition of tensor products of fundamental $\mathfrak{sl}_{n}$-modules. This yields a combinatorial decomposition of the Fock spaces in their irreducible components and the branching law for the restriction of the irreducible highest weight $\mathfrak{sl}_{\infty}$-modules to $\hat{\mathfrak{sl}_{e}}$.

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