Composition Kostka functions

The Bailey lemma and Kostka polynomials

Using the theory of Kostka polynomials, we prove an A_{n-1} version of Bailey's lemma at integral level. Exploiting a new, conjectural expansion for Kostka numbers, this is then generalized to fractional levels, leading to a new expression for admissible characters of A_{n-1}^{(1)} and to identities for A-type branching functions.

Fermionic formulas for level-restricted generalized Kostka polynomials and coset branching functions

Level-restricted paths play an important role in crystal theory. They correspond to certain highest weight vectors of modules of quantum affine algebras. We show that the recently established bijection between Littlewood--Richardson tableaux and rigged configurations is well-behaved with respect to level-restriction and give an explicit characterization of level-restricted rigged configurations. As a consequence a new general fermionic formula for the level-restricted generalized Kostka polynomial is obtained. Some coset branching functions of type $A$ are computed by taking limits of these fe…

A short proof of the integrality of the Macdonald (q,t)-Kostka coefficients

The Macdonald polynomials can be obtained by acting on the constant 1 with creation operators. Three different expressions for these operators are derived, one from the other, in a rather succint way. When the last of these expressions is used, the formalism is seen to imply straightforwardly the integrality of the (q,t)-Kostka coefficients, that is of the expansion coefficients for the Macdonald functions in terms of Schur functions.

Spin Kostka 多项式与顶点算子

Spin Kostka polynomials and vertex operators

本文通过顶点算子给出 spin Kostka-Foulkes 多项式的迭代公式，获得平行性质与标记表计数公式，并证实 Aokage 猜想。

Generalized Energy Statistics and Kostka--Macdonald Polynomials

We give an interpretation of the t=1 specialization of the modified Macdonald polynomial as a generating function of the energy statistics defined on the set of paths arising in the context of Box-Ball Systems (BBS-paths for short). We also introduce one parameter generalizations of the energy statistics on the set of BBS-paths which all, conjecturally, have the same distribution.

Q-Kostka多项式与自旋Green多项式

Q-Kostka polynomials and spin Green polynomials

本文利用顶点算子实现研究Q-Kostka多项式并建立其稳定性，同时引入自旋Green多项式作为Green多项式的类似物和自旋不可约特征标的形变，给出迭代公式及相关性质。

Paths and Kostka--Macdonald Polynomials

We give several equivalent combinatorial descriptions of the space of states for the box-ball systems, and connect certain partition functions for these models with the q-weight multiplicities of the tensor product of the fundamental representations of the Lie algebra gl(n). As an application, we give an elementary proof of the special case t=1 of the Haglund--Haiman--Loehr formula. Also, we propose a new class of combinatorial statistics that naturally generalize the so-called energy statistics.

Tableaux statistics for two part Macdonald polynomials

The Macdonald polynomials expanded in terms of a modified Schur function basis have coefficients called the $q,t$-Kostka polynomials. We define operators to build standard tableaux and show that they are equivalent to creation operators that recursively build the Macdonald polynomials indexed by two part partitions. We uncover a new basis for these particular Macdonald polynomials and in doing so are able to give an explicit description of their associated $q,t$-Kostka coefficients by assigning a statistic in $q$ and $t$ to each standard tableau.

q-Analogs of symmetric function operators

For any homomorphism V on the space of symmetric functions, we introduce an operation which creates a q-analog of V. By giving several examples we demonstrate that this quantization occurs naturally within the theory of symmetric functions. In particular, we show that the Hall-Littlewood symmetric functions are formed by taking this q-analog of the Schur symmetric functions and the Macdonald symmetric functions appear by taking the q-analog of the Hall-Littlewood symmetric functions in the parameter t. This relation is then used to derive recurrences on the Macdonald q,t-Kostka coefficients.

Quantum Schubert polynomials and quantum Schur functions

We introduce the quantum multi-Schur functions, quantum factorial Schur functions and quantum Macdonald polynomials. We prove that for restricted vexillary permutations the quantum double Schubert polynomial coincides with some quantum multi-Schur function and prove a quantum analog of the Nagelsbach-Kostka and Jacobi-Trudi formulae for the quantum double Schubert polynomials in the case of Grassmannian permutations. We prove, also, an analog of the Billey-Jockusch-Stanley formula for quantum Schubert polynomials. Finally we formulate two conjectures about the structure of quantum double and q…

圈积Macdonald多项式的Tesler恒等式

Tesler identities for wreath Macdonald polynomials

本研究利用量子环面代数与shuffle代数生成的圈积Macdonald多项式本征算子，给出将其映射到配分特征δ函数的算子显式公式，证明了互反性相关新结果，还开展了圈积插值Macdonald多项式研究并推导相关系数公式与双谱问题解。