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arXiv 2001.02967math.RT
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半单局部有限的李代数模

Lie algebra modules which are locally finite over the semi-simple part

Volodymyr Mazorchuk, Rafael Mrđen

摘要:

对于具有固定Levi分解$\mathfrak{L} = \mathfrak{g} \oplus \mathfrak{r}$的$\mathbb{C}$上的有限维李代数$\mathfrak{L}$,其中$\mathfrak{g}$是半单的,我们研究了$\mathfrak{L}$ -模作为$\mathfrak{g}$ -模分解为有限重数的简单有限维$\mathfrak{g}$ -模的直和.我们把这种模称为$\mathfrak{g}$ -Harish-Chandra模。本文给出了与$\mathfrak{g} = \mathfrak{sl}_2$相关联的Takiff李代数和Schrödinger李代数的单$\mathfrak{g}$-Harish-Chandra模的完全分类,并在其它情形下得到了部分结果.适应版本的恩莱特和Arkhipov的完成函子起着至关重要的作用,在我们的论点。此外,我们还计算了Takiff $\mathfrak{sl}_2$和Schrödinger李代数的无限维单$\mathfrak{g}$-Harish-Chandra模及其零化子在泛包络代数中的第一扩张群.在一般情况下,给出了无穷维单$\mathfrak{g}$ -Harish-Chandra模存在的一个充分条件.

英文摘要:

For a finite-dimensional Lie algebra $\mathfrak{L}$ over $\mathbb{C}$ with a fixed Levi decomposition $\mathfrak{L} = \mathfrak{g} \oplus \mathfrak{r}$ where $\mathfrak{g}$ is semi-simple, we investigate $\mathfrak{L}$-modules which decompose, as $\mathfrak{g}$-modules, into a direct sum of simple finite-dimensional $\mathfrak{g}$-modules with finite multiplicities. We call such modules $\mathfrak{g}$-Harish-Chandra modules. We give a complete classification of simple $\mathfrak{g}$-Harish-Chandra modules for the Takiff Lie algebra associated to $\mathfrak{g} = \mathfrak{sl}_2$, and for the Schrödinger Lie algebra, and obtain some partial results in other cases. An adapted version of Enright's and Arkhipov's completion functors plays a crucial role in our arguments. Moreover, we calculate the first extension groups of infinite-dimensional simple $\mathfrak{g}$-Harish-Chandra modules and their annihilators in the universal enveloping algebra, for the Takiff $\mathfrak{sl}_2$ and the Schrödinger Lie algebra. In the general case, we give a sufficient condition for the existence of infinite-dimensional simple $\mathfrak{g}$-Harish-Chandra modules.

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