# A combinatorial decomposition of higher level Fock spaces

Abstract : 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 $\widehat{\mathfrak{sl}_{e}}$.
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Cited literature [14 references]

https://hal.archives-ouvertes.fr/hal-00669336
Contributor : Nicolas Jacon <>
Submitted on : Monday, February 13, 2012 - 8:42:44 AM
Last modification on : Tuesday, August 28, 2018 - 7:48:02 AM
Long-term archiving on : Monday, May 14, 2012 - 2:21:36 AM

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• HAL Id : hal-00669336, version 1
• ARXIV : 1202.2668

### Citation

Nicolas Jacon, Cédric Lecouvey. A combinatorial decomposition of higher level Fock spaces. Osaka Journal of Mathematics, Osaka University, 2013, ANR-12-JS01-0003 (3), 18 p. ⟨hal-00669336⟩

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