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arXiv 1703.04028math.RTmath-phmath.MP
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Harish-Chandra模的表示与代数族的压缩

Contractions of Representations and Algebraic Families of Harish-Chandra Modules

Joseph Bernstein, Nigel Higson, Eyal Subag

摘要:

我们从代数的角度研究了一些家庭的酉群表示出现在数学物理和相关的收缩家庭的李群。群的收缩族与约化群的不同实形式相关,并且是连续参数化的,但是酉表示是在包括离散部分和连续部分的参数子空间上定义的。有限维和无限维表示都可以出现,甚至在同一个族中。我们将研究最简单的非平凡的例子,并使用在前面的论文中介绍的哈里什-钱德拉对和哈里什-钱德拉模的代数族的概念,以及Jantzen过滤,来代数地构造这些酉表示族。

英文摘要:

We examine from an algebraic point of view some families of unitary group representations that arise in mathematical physics and are associated to contraction families of Lie groups. The contraction families of groups relate different real forms of a reductive group and are continuously parametrized, but the unitary representations are defined over a parameter subspace that includes both discrete and continuous parts. Both finite- and infinite-dimensional representations can occur, even within the same family. We shall study the simplest nontrivial examples, and use the concepts of algebraic families of Harish-Chandra pairs and Harish-Chandra modules, introduced in a previous paper, together with the Jantzen filtration, to construct these families of unitary representations algebraically.

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