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Please use this identifier to cite or link to this item: http://hdl.handle.net/1860/1936

Title: Tableaux on k + 1-cores, reduced words for affine permutations, and k-Schur expansions
Authors: Morse, Jennifer
Lapointe, Luc
Issue Date: 19-Feb-2004
Citation: Retrieved October 30, 2007 from http://lanl.arxiv.org/find/math/1/au:+Morse_J/0/1/0/all/0/1
Abstract: The k-Young lattice Y k is a partial order on partitions with no part larger than k. This weak subposet of the Young lattice originated [9] from the study of the k-Schur functions s (k) , symmetric functions that form a natural basis of the space spanned by homogeneous functions indexed by k-bounded partitions. The chains in the k-Young lattice are induced by a Pieri-type rule experimentally satisfied by the k-Schur functions. Here, using a natural bijection between k-bounded partitions and k + 1-cores, we establish an algorithm for identifying chains in the k- Young lattice with certain tableaux on k+1 cores. This algorithm reveals that the k-Young lattice is isomorphic to the weak order on the quotient of the affine symmetric group ˜ Sk+1 by a maximal parabolic subgroup. From this, the conjectured k-Pieri rule implies that the k-Kostka matrix connecting the homogeneous basis {h } 2Y k to {s (k) } 2Y k may now be obtained by counting appropriate classes of tableaux on k + 1-cores. This suggests that the conjecturally positive k- Schur expansion coefficients for Macdonald polynomials (reducing to q, t-Kostka polynomials for large k) could be described by a q, t-statistic on these tableaux, or equivalently on reduced words for affine permutations.
URI: http://lanl.arxiv.org/abs/math/0402320v1
http://hdl.handle.net/1860/1936
Appears in Collections:Faculty Research and Publications (Mathematics)

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