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arXiv 2102.08859math.RTmath.NT
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约束、L参数和真实表示的局部系数

Restrictions, L-parameters, and local coefficients for genuine representations

Fan Gao, Freydoon Shahidi, Dani Szpruch

摘要:

我们考虑了覆叠群和它的导子群之间表示的限制和归纳,包括表示论方面和L-参数方面。特别地,对真主列的约束进行了详细的分析.本文还讨论了辛相似群的复盖的亚辛张量积构造,并指出这种构造对其它群的普遍性。进一步,利用酉非分歧主列的任意不可约分量,证明了其限制于导出子群的重数公式,并给出了三个相关R-群的重数公式.在本文的后半部分,我们研究了一个非分歧的L-包,讨论了包中元素的参数化如何随着超特殊极大紧子群及其分裂的不同选择而变化。我们还调查了这样的L-包内的元素的泛型相对于不同的惠特克数据。针对这两个问题,本文最后详细讨论了辛相似群的覆盖。

英文摘要:

We consider the restriction and induction of representations between a covering group and its derived subgroup, both on the representation-theoretic side and the L-parameter side. In particular, restriction of a genuine principal series is analyzed in detail. We also discuss a metaplectic tensor product construction for covers of the symplectic similitudes groups, and remark on the generality of such a construction for other groups. Furthermore, working with an arbitrary irreducible constituent of a unitary unramified principal series, we prove a multiplicity formula for its restriction to the derived subgroup in terms of three associated R-groups. Later in the paper, we study an unramified L-packet on how the parametrization of elements inside such a packet varies along with different choices of hyperspecial maximal compact subgroups and their splittings. We also investigate the genericity of elements inside such an L-packet with respect to varying Whittaker datum. Pertaining to the above two problems, covers of the symplectic similitudes groups are discussed in detail in the last part of the paper.

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