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Transactions of the American Mathematical Society

ISSN 1088-6850(online) ISSN 0002-9947(print)



Irreducible representations of $ A\sb{n}$ with a $ 1$-dimensional weight space

Authors: D. J. Britten and F. W. Lemire
Journal: Trans. Amer. Math. Soc. 273 (1982), 509-540
MSC: Primary 17B10
MathSciNet review: 667158
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Abstract: In this paper we classify all irreducible linear representations of the simple Lie algebra $ {A_n}$ which admit a one-dimensional weight space with respect to some Cartan subalgebra $ H$ of $ {A_n}$. We first show that the problem is equivalent to determining all algebra homomorphisms from the centralizer of the Cartan subalgebra $ H$ in the universal enveloping algebra of $ {A_n}$ to the base field. We construct all such algebra homomorphisms and provide conditions under which two such algebra homomorphisms provide inequivalent irreducible representations of $ {A_n}$.

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Keywords: Irreducible representations, weight space decomposition, Harish-Chandra homomorphism
Article copyright: © Copyright 1982 American Mathematical Society