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arXiv 0802.1408math.RT
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Kazhdan-Lusztig细胞的广义诱导

Generalized induction of Kazhdan-Lusztig cells

Jeremie Guilhot

摘要:

在Lusztig之后,我们考虑了一个Coxeter群$W$和一个权函数. Geck表明$W$的Kazhdan-Lusztig细胞与抛物子群相容。本文将这一结论推广到$W$的某些不一定是抛物子群的子集。我们得到两个应用:证明了在特定的参数技术条件下,$W$的某个有限抛物子群的胞腔是整个群中的胞腔,并对一类权函数将仿射外尔群$\tilde{G}_{2}$分解为左胞腔和双侧胞腔.

英文摘要:

Following Lusztig, we consider a Coxeter group $W$ together with a weight function. Geck showed that the Kazhdan-Lusztig cells of $W$ are compatible with parabolic subgroups. In this paper, we generalize this argument to some subsets of $W$ which may not be parabolic subgroups. We obtain two applications: we show that under specific technical conditions on the parameters, the cells of a certain finite parabolic subgroup of $W$ are cells in the whole group, and we decompose the affine Weyl group $\tilde{G}_{2}$ into left and two-sided cells for a whole class of weight functions.

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