On Kerov polynomials for Jack characters

Abstract

We consider a deformation of Kerov character polynomials, linked to Jack symmetric functions. It has been introduced recently by M. Lassalle, who formulated several conjectures on these objects, suggesting some underlying combinatorics. We give a partial result in this direction, showing that some quantities are polynomials in the Jack parameter $\alpha$ with prescribed degree. Our result has several interesting consequences in various directions. Firstly, we give a new proof of the fact that the coefficients of Jack polynomials expanded in the monomial or power-sum basis depend polynomially in $\alpha$. Secondly, we describe asymptotically the shape of random Young diagrams under some deformation of Plancherel measure.

This version is an extended abstract (12 pages, 1 figure) of arXiv:1402.4615 with significantly fewer results and a different title

References in corpus (4)

• Jack polynomials and free cumulants
• A conjectured combinatorial interpretation of the normalized irreducible character values of the symmetric group
• The uses of random partitions
• Structure coefficients of the Hecke algebra of $(S_{2n},B_n)$

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