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矩阵Kazhdan-Lusztig多项式分解的研究

On factorization of matrix of Kazhdan-Lusztig polynomials

Peking University(北京大学);The LNM Institute of Information Technology(LNM信息技术研究所);Indian Institute of Technology Dharwad(达尔瓦德印度理工学院)

Aritra Bhattacharya, Ashish Mishra, Shraddha Srivastava

AI总结:

本文研究了Hecke代数中Kazhdan-Lusztig多项式矩阵的分解问题,证明其可分解为多个矩阵的乘积,并通过几何方法证明了系数的非负性。

摘要:

令\mathcal{H}=\mathcal{H}(W,S)是Coxeter系统(W,S) over\mathbb{Z}[q^{\pm1}]的Hecke代数,其中W是对称Kac-Moody代数的Weyl群。在本文中,我们证明了\mathcal{H}的Kazhdan-Lusztig多项式矩阵可以分解为|S|个矩阵的乘积,每个矩阵的条目都是q的多项式,且系数非负。为了实现这一目标,我们使用了由Grojnowski-Haiman定义的混合基TC^J,其中J⊆S。上述分解中的中间矩阵实际上是从TC^J基到TC^I基的过渡矩阵,其中I⊆J。等价地,这些系数可以通过从\mathcal{H}到抛物线Hecke代数\mathcal{H}_J的自然限制映射来计算。此外,遵循Grojnowski-Haiman的想法,我们还给出了这些系数正性的几何证明。

英文摘要:

Let $\mathcal{H} = \mathcal{H}(W,S)$ be the Hecke algebra of the Coxeter system $(W,S)$ over $\mathbb{Z}[q^{\pm1}]$, where $W$ is the Weyl group of a symmetrizable Kac-Moody algebra. In this paper, we show that the matrix of Kazhdan-Lusztig polynomials of $\mathcal{H}$ factorizes into a product of $|S|$ many matrices, each of which has entries as polynomials in $q$ with nonnegative coefficients. To achieve this goal, we use hybrid basis $TC^J$ for $J\subseteq S$ of $\mathcal{H}$, defined by Grojnowski-Haiman. The intermediate matrices in the aforementioned factorization turn out to be the transition matrices from $TC^J$-basis to $TC^I$-basis for $I\subset J$. Equivalently, these coefficients can be computed using a natural restriction map from $\mathcal{H}$ to the parabolic Hecke algebra $\mathcal{H}_J$. Moreover, following the ideas from Grojnowski-Haiman, we also give a geometric proof of the positivity of these coefficients.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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