Coincident root loci and Jack and Macdonald polynomials for special values of the parameters

Details Coincident root loci and Jack and Macdonald polynomials for special values of the parameters Coincident root loci and Jack and Macdonald polynomials for special values of the parameters

2004-04-05

arxiv.org/abs/math/0404079v1

Mathematics

Quantum Algebra

19 pages, Proceedings of "Jack and Macdonald polynomials" meeting (ICMS, Edinburgh, September 2003)

Scientific paper

We consider the coincident root loci consisting of the polynomials with at least two double roots andpresent a linear basis of the corresponding ideal in the algebra of symmetric polynomials in terms of the Jack polynomials with special value of parameter $\alpha = -2.$ As a corollary we present an explicit formula for the Hilbert-Poincar\`e series of this ideal and the generator of the minimal degree as a special Jack polynomial. A generalization to the case of the symmetric polynomials vanishing on the double shifted diagonals and the Macdonald polynomials specialized at $t^2 q = 1$ is also presented. We also give similar results for the interpolation Jack polynomials.

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