Character Formulae of $\hat{sl}_n$-Modules and Inhomogeneous Paths

Details Character Formulae of $\hat{sl}_n$-Modules and Inhomogeneous Paths Character Formulae of $\hat{sl}_n$-Modules and Inhomogeneous Paths

1998-02-18

arxiv.org/abs/math/9802085v2

Nuclear Physics B 536 [PM] (1999), 575-616

Mathematics

Quantum Algebra

42 pages, LaTeX2.09

Scientific paper

10.1016/S0550-3213(98)00647-6

Let B_{(l)} be the perfect crystal for the l-symmetric tensor representation of the quantum affine algebra U'_q(\hat{sl(n)}). For a partition mu = (mu_1,...,mu_m), elements of the tensor product B_{(mu_1)} \otimes ... \otimes B_{(mu_m)} can be regarded as inhomogeneous paths. We establish a bijection between a certain large mu limit of this crystal and the crystal of an (generally reducible) integrable U_q(\hat{sl(n)})-module, which forms a large family depending on the inhomogeneity of mu kept in the limit. For the associated one dimensional sums, relations with the Kostka-Foulkes polynomials are clarified, and new fermionic formulae are presented. By combining their limits with the bijection, we prove or conjecture several formulae for the string functions, branching functions, coset branching functions and spinon character formula of both vertex and RSOS types.

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