Complete homogeneous symmetric polynomials in Jucys-Murphy elements and the Weingarten function

Jucys-Murphy elements and Weingarten matrices

We provide a compact proof of the recent formula of Collins and Matsumoto for the Weingarten matrix of the orthogonal group using Jucys-Murphy elements.

Jucys-Murphy Elements and a Combinatorial Proof of an Identity of S. Kerov

Consider the elements of the group algebra CS_{n} given by R_{j}=Sigma_{i=1}^{j-1}(ij), for 2<=j<=n. Jucys [3 - 5] and Murphy[7] showed that these elements act diagonally on elements of S_{n} and gave explicit formulas for the diagonal entries. As requested by the late S. Kerov, we give a combinatorial proof of this work in case j=n and present several similar results which arise from these combinatorial methods.

Jucys-Murphy Elements and Unitary Matrix Integrals

In this paper, we study the relationship between polynomial integrals on the unitary group and the conjugacy class expansion of symmetric functions in Jucys-Murphy elements. Our main result is an explicit formula for the top coefficients in the class expansion of monomial symmetric functions in Jucys-Murphy elements, from which we recover the first order asymptotics of polynomial integrals over $\U(N)$ as $N \rightarrow \infty$. Our results on class expansion include an analogue of Macdonald's result for the top connection coefficients of the class algebra, a generalization of Stanley and Olsh…

Transitive powers of Young-Jucys-Murphy elements are central

Although powers of the Young-Jucys-Murphya elements X_i = (1 i) + ... +(i-1 i), i = 1, ..., n, in the symmetric group S_n acting on {1, ...,n} do not lie in the centre of the group algebra of S_n, we show that transitive powers, namely the sum of the contributions from elements that act transitively on {1, >...,n}, are central. We determine the coefficients, which we call star factorization numbers, that occur in the resolution of transitive powers with respect to the class basis of the centre of S_n, and show that they have a polynomiality property. These centrality and polynomiality properti…

通过Jucys-Murphy元素之和进行洗牌

Shuffling via sums of Jucys--Murphy Elements

本文研究了一种通过对称群S_m的Jucys-Murphy元素对应的置换进行洗牌的家族，确定了这些洗牌的转移矩阵的本征值，并研究了特定情况下的混合时间，证明了k-星置换洗牌在总变差截止时具有特定的渐进行为。

Monomial bases for the centres of the group algebra and Iwahori--Hecke algebra of S_4

G. E. Murphy showed in 1983 that the centre of every symmetric group algebra has an integral basis consisting of a specific set of monomial symmetric polynomials in the Jucys--Murphy elements. While we have shown in earlier work that the centre of the group algebra of S_3 has exactly three additional such bases, we show in this paper that the centre of the group algebra of S_4 has infinitely many bases consisting of monomial symmetric polynomials in Jucys--Murphy elements, which we characterize completely. The proof of this result involves establishing closed forms for coefficients of class su…

A new integral basis for the centre of the Hecke algebra of type A

We describe a recursive algorithm that produces an integral basis for the centre of the Hecke algebra of type A consisting of linear combinations of monomial symmetric polynomials of Jucys--Murphy elements. We also discuss the existence of integral bases for the centre of the Hecke algebra that consist solely of monomial symmetric polynomials of Jucys--Murphy elements. Finally, for n=3, we show that only one such basis exists for the centre of the Hecke algebra, by proving that there are exactly four bases for the centre of the corresponding symmetric group algebra which consist solely of mono…

从实格拉斯曼流形的 Weingarten 演算到单调 Hurwitz 数与 Jucys-Murphy 元的形变

From Weingarten calculus for real Grassmannians to deformations of monotone Hurwitz numbers and Jucys-Murphy elements

本文通过实格拉斯曼流形上的积分引入 b-Weingarten 演算，定义 bt-单调 Hurwitz 数，并提出 Jucys-Murphy 元的 b-形变算子及其与 Jack 对称函数相关的若干猜想。

带广义Jucys-Murphy权重的Coxeter因子分解与反射群的矩阵树定理

Coxeter factorizations with generalized Jucys-Murphy weights and Matrix Tree theorems for reflection groups

该研究针对良生成反射群，基于W-拉普拉斯算子谱给出Coxeter元反射分解的加权计数通用公式，推广矩阵树/森林定理，引入Jucys-Murphy元变体与塔等价概念，并拓展至Coxeter组合学其他问题。

On the fusion procedure for the symmetric group

We give a new version of the fusion procedure for the symmetric group which originated in the work of Jucys and was developed by Cherednik. We derive it from the Jucys-Murphy formulas for the diagonal matrix units for the symmetric group.

Contents of partitions and the combinatorics of permutation factorizations in genus 0

The central object of study is a formal power series that we call the content series, a symmetric function involving an arbitrary underlying formal power series $f$ in the contents of the cells in a partition. In previous work we have shown that the content series satisfies the KP equations. The main result of this paper is a new partial differential equation for which the content series is the unique solution, subject to a simple initial condition. This equation is expressed in terms of families of operators that we call $\mathcal{U}$ and $\mathcal{D}$ operators, whose action on the Schur sym…

Quantum Hurwitz numbers and Macdonald polynomials

Parametric families in the centre ${\bf Z}({\bf C}[S_n])$ of the group algebra of the symmetric group are obtained by identifying the indeterminates in the generating function for Macdonald polynomials as commuting Jucys-Murphy elements. Their eigenvalues provide coefficients in the double Schur function expansion of 2D Toda $τ$-functions of hypergeometric type. Expressing these in the basis of products of power sum symmetric functions, the coefficients may be interpreted geometrically as parametric families of quantum Hurwitz numbers, enumerating weighted branched coverings of the Riemann sph…

Weighted Hurwitz numbers and hypergeometric $τ$-functions: an overview

This is an overview of recent results on the use of 2D Toda $τ$-functions as generating functions for multiparametric families of weighted Hurwitz numbers. The Bose-Fermi equivalence composed with the characteristic map provides an isomorphism between the zero charge sector of the Fermionic Fock space and the direct sum of the centers of the group algebra of the symmetric groups $S_n$. Specializing the fermionic formula to the case of diagonal group elements gives $τ$-functions of hypergeometric type, for which the expansion over products of Schur functions is diagonal, with coefficients of {\…