Enveloping algebra U(gl(3)) and orthogonal polynomials in several discrete indeterminates

2002/02/18 by Alexander Sergeev
Mathematics · #math.RT #msc:17B10 #msc:17B65 #msc:33C45 #msc:33C80

paper · pdf

published as Duplij S., Wess J. (eds.) Noncommutative structures in mathematics and physics, Proc. NATO Advanced Research Workshop, Kiev, 2000. Kluwer, 2001, 113--124 · 12p., Latex

arxiv created 2002/02/18 · arxiv updated 2009/11/30

Abstract

Let A be an associative complex algebra and L an invariant linear functional on it (trace). Let i be an involutive antiautomorphism of A such that L(i(a))=L(a) for any a in A. Then A admits a symmetric invariant bilinear form (a, b)=L(a i(b)). For A=U(sl(2))/m, where m is any maximal ideal of U(sl(2)), Leites and I have constructed orthogonal basis whose elements turned out to be, essentially, Chebyshev and Hahn polynomials in one discrete variable. Here I take A=U(gl(3))/m for the maximal ideals m which annihilate irreducible highest weight gl(3)-modules of particular form (generalizations of symmetric powers of the identity representation). In this way we obtain multivariable analogs of Hahn polynomials.

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