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arXiv 1502.06483math.RT
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广义和退化Whittaker模型

Generalized and degenerate Whittaker models

Raul Gomez, Dmitry Gourevitch, Siddhartha Sahi

摘要:

本文研究了局部特征为零(阿基米德或非阿基米德)域上约化群的广义和退化Whittaker模型。我们的主要结果是从对应于幂零轨道的广义Whittaker模型到对应于相同轨道的任何退化Whittaker模型以及到对应于更大轨道的某些退化Whittaker模型的满态映射的构造。我们还给出了广义和退化Whittaker模型的无选择定义。最后,我们解释了我们的方法如何暗示类似的结果的惠特克-傅里叶系数。对于$\mathrm{GL}_n(F)$,这意味着一个光滑的容许表示$π$具有一个广义惠特克模型$\mathcal{W}_{\mathcal{O}}(π)$,对应于一个幂零余伴轨道$\mathcal{O}$当且仅当$\mathcal{O}$位于波前集$\mathrm{WF}(π)$的(闭包)中。以前,已知这仅适用于$F$非阿基米德和$\mathcal{O}$最大值在$\mathrm{WF}(π)$中,参见[MW 87]。我们还将$\mathcal{W}_{\mathcal{O}}(π)$表示为Bernstein-Zelevinsky导数[BZ 77,AGS 15 a]的一个版本的迭代。这使我们能够扩展到$\mathrm{GL_n}(\mathbb{R})$和$\mathrm{GL_n}(\mathbb{C})$几个进一步的结果从[MW 87]的维数的$\mathcal{W}_{\mathcal{O}}(π)$和精确的广义惠特克函子。

英文摘要:

We study generalized and degenerate Whittaker models for reductive groups over local fields of characteristic zero (archimedean or non-archimedean). Our main result is the construction of epimorphisms from the generalized Whittaker model corresponding to a nilpotent orbit to any degenerate Whittaker model corresponding to the same orbit, and to certain degenerate Whittaker models corresponding to bigger orbits. We also give choice-free definitions of generalized and degenerate Whittaker models. Finally, we explain how our methods imply analogous results for Whittaker-Fourier coefficients of automorphic representations. For $\mathrm{GL}_n(F)$ this implies that a smooth admissible representation $π$ has a generalized Whittaker model $\mathcal{W}_{\mathcal{O}}(π)$ corresponding to a nilpotent coadjoint orbit $\mathcal{O}$ if and only if $\mathcal{O}$ lies in the (closure of) the wave-front set $\mathrm{WF}(π)$. Previously this was only known to hold for $F$ non-archimedean and $\mathcal{O}$ maximal in $\mathrm{WF}(π)$, see [MW87]. We also express $\mathcal{W}_{\mathcal{O}}(π)$ as an iteration of a version of the Bernstein-Zelevinsky derivatives [BZ77,AGS15a]. This enables us to extend to $\mathrm{GL_n}(\mathbb{R})$ and $\mathrm{GL_n}(\mathbb{C})$ several further results from [MW87] on the dimension of $\mathcal{W}_{\mathcal{O}}(π)$ and on the exactness of the generalized Whittaker functor.

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