arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1905.04080math.RTmath.QA
收藏

对称群的亏2自旋块与正则基系数

Defect 2 spin blocks of symmetric groups and canonical basis coefficients

Matthew Fayers

摘要:

研究了对称群的旋量表示在奇特征下的分解数问题。我们的主要目的是找到一个组合公式的分解数块的缺陷$2$,类似于理查兹的公式缺陷$2$块的对称群。通过对Richards所用的组合数学进行适当的类比,我们找到了相应的“$q$ -分解数“的公式,即在$A^{(2)}_{2n}$型的水平- $1$ $q$ -变形的Fock空间中的规范基系数; Leclerc和Thibon猜想的一个特例断言这些系数产生特征$2n+1$中的自旋分解数。在此过程中,我们证明了关于$q$ -分解数的一些一般性结果。本文代表了$A^{(2)}_{2n}$型规范基的第一个实质性进展。

英文摘要:

This paper addresses the decomposition number problem for spin representations of symmetric groups in odd characteristic. Our main aim is to find a combinatorial formula for decomposition numbers in blocks of defect $2$, analogous to Richards's formula for defect $2$ blocks of symmetric groups. By developing a suitable analogue of the combinatorics used by Richards, we find a formula for the corresponding "$q$-decomposition numbers", i.e.\ the canonical basis coefficients in the level-$1$ $q$-deformed Fock space of type $A^{(2)}_{2n}$; a special case of a conjecture of Leclerc and Thibon asserts that these coefficients yield the spin decomposition numbers in characteristic $2n+1$. Along the way, we prove some general results on $q$-decomposition numbers. This paper represents the first substantial progress on canonical bases in type $A^{(2)}_{2n}$.

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。

↑