Chevalley formula for anti-dominant weights in the equivariant K-theory of semi-infinite flag manifolds

Chevalley formula for anti-dominant weights in the equivariant K-theory of semi-infinite flag manifolds
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半无限旗形流形等变K理论中反支配权值的Chevalley公式

DOI:
10.1016/j.aim.2021.107828
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发表时间:
2021
影响因子:
1.7
通讯作者:
D. Sagaki
D. Sagaki
中科院分区:
数学1区
文献类型:
--
作者:
S. Naito;D. Orr;D. Sagaki

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证明了半无限旗流形的环面等变K-群中反主导权的Chevalley公式,该公式用半无限Lakshmibai-Seshadri路径(或等价的量子Lakshmibai-Seshadri路径)来描述;与我们以前的文献[17]中主导权的Chevalley公式相比,反主导权的Chevalley公式具有显著的有限性.基于[17]中的几何结果,我们的证明是表示论的,并且反占优权的Chevalley公式由量子仿射代数上零级极权模的Demazure子模的分次特征标的某种恒等式导出;在证明这个身份时,我们使用半无限Lakshmibai-Seshadri路径的(组合)标准单项式理论,以及固定形状的半无限Lakshmibai-Seshadri路径集合的Demazure类子集的弦性质,其给出了零级极值权重模块的晶体基的显式实现。
We prove a Chevalley formula for anti-dominant weights in the torus-equivariantK-group of semi-infinite flag manifolds, which is described explicitly in terms of semi-infinite Lakshmibai-Seshadri paths (or equivalently, quantum Lakshmibai-Seshadri paths); in contrast to the Chevalley formula for dominant weights in our previous paper [17], the formula for anti-dominant weights has a significant finiteness property. Based on geometric results established in [17], our proof is representation-theoretic, and the Chevalley formula for anti-dominant weights follows from a certain identity for the graded characters of Demazure submodules of a level-zero extremal weight module over a quantum affine algebra; in the proof of this identity, we make use of the (combinatorial) standard monomial theory for semi-infinite Lakshmibai-Seshadri paths, and also a string property of Demazure-like subsets of the set of semi-infinite Lakshmibai-Seshadri paths of a fixed shape, which gives an explicit realization of the crystal basis of a level-zero extremal weight module.
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