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arXiv 0810.0638math.RT
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p-adic群G_2的主列的几何结构

Geometric structure in the principal series of the p-adic group G_2

Anne-Marie Aubert, Paul Baum, Roger Plymen

摘要:

在约化$p$ -进群$G$的表示论中,诱导表示的约化问题是一个非常复杂的问题.这是我们的论点,在[3]中表示为一个猜想,存在着一个简单的几何结构,这个复杂的理论。我们将在这里用$G_2$的主列的一些详细计算来说明这个猜想。本文的一个特点是在某些扩展的仿射Weyl群中附加到双侧胞$c$上的余特征标$h_c$所起的作用。在伯恩斯坦程序中出现的商变量被扩展的商变量所取代。我们形成所有这些扩展商簇的不交并$A(G)$。我们猜想,经过简单的代数变形,空间$A(G)$是光滑对偶$Irr(G)$的模型。在这方面,我们的纲领是伯恩斯坦纲领的一种结构上的改进。代数变形由余特征标$h_c$控制,在某些扩展的仿射Weyl群中,每个双边胞腔$c$对应一个余特征标。的cocharacters本身似乎是密切相关的朗兰兹参数。

英文摘要:

In the representation theory of reductive $p$-adic groups $G$, the issue of reducibility of induced representations is an issue of great intricacy. It is our contention, expressed as a conjecture in [3], that there exists a simple geometric structure underlying this intricate theory. We will illustrate here the conjecture with some detailed computations in the principal series of $G_2$. A feature of this article is the role played by cocharacters $h_c$ attached to two-sided cells $c$ in certain extended affine Weyl groups. The quotient varieties which occur in the Bernstein programme are replaced by extended quotients. We form the disjoint union $A(G)$ of all these extended quotient varieties. We conjecture that, after a simple algebraic deformation, the space $A(G)$ is a model of the smooth dual $Irr(G)$. In this respect, our programme is a conjectural refinement of the Bernstein programme. The algebraic deformation is controlled by cocharacters $h_c$, one for each two-sided cell $c$ in certain extended affine Weyl groups. The cocharacters themselves appear to be closely related to Langlands parameters.

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