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arXiv 2102.07942math.RT
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$Sp(2n, \mathbb{R})$和$SO^*(2n)$的某些酉表示的Dirac指数

Dirac index of some unitary representations of $Sp(2n, \mathbb{R})$ and $SO^*(2n)$

Chao-Ping Dong, Kayue Daniel Wong

摘要:

令$G$为$Sp(2n, \mathbb{R})$或$SO^*(2n)$。我们计算了Vogan在[Vog 84]第8节中考虑的一大类酉表示的Dirac指标,其中包括所有弱公平$A_{\mathfrak{q}}(λ)$模和$G$的(弱)幂幺表示作为两个极端情况.我们猜想这些表示穷尽了具有非零Dirac上同调的$G$的所有酉表示。在一般情况下,对于某些不可约么正模的一个等秩群,我们澄清之间的联系,可能的取消在其狄拉克指数,和奇偶性的自旋最低$K$ -类型。

英文摘要:

Let $G$ be $Sp(2n, \mathbb{R})$ or $SO^*(2n)$. We compute the Dirac index of a large class of unitary representations considered by Vogan in Section 8 of [Vog84], which include all weakly fair $A_{\mathfrak{q}}(λ)$ modules and (weakly) unipotent representations of $G$ as two extreme cases. We conjecture that these representations exhaust all unitary representations of $G$ with nonzero Dirac cohomology. In general, for certain irreducible unitary module of an equal rank group, we clarify the link between the possible cancellations in its Dirac index, and the parities of its spin-lowest $K$-types.

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