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arXiv 0812.2059math.RT
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Clifford代数的Harish-Chandra同构

The Harish-Chandra isomorphism for Clifford algebras

Yuri Bazlov

摘要:

研究了半单李代数$g$的Clifford代数$Cl(g)$代替泛包络代数的Harish-Chandra同态的类似问题.实现了两个主要目标。首先证明了$Cl(g)$中的$g$ -不变量的子代数与$g$的Cartan子代数的Clifford代数之间存在Harish-Chandra型同构。其次,Cartan子代数被确定,通过这种同构,与所谓的原始反对称不变量的$g$的分次空间。这导致了一个杰出的正交基的Cartan子代数,这原来是诱导从李代数朗兰兹对偶$g$通过其主要的三维子代数的行动。这就解决了科斯坦特的一个猜想。

英文摘要:

We study the analogue of the Harish-Chandra homomorphism where the universal enveloping algebra is replaced by the Clifford algebra, $Cl(g)$, of a semisimple Lie algebra $g$. Two main goals are achieved. First, we prove that there is a Harish-Chandra type isomorphism between the subalgebra of $g$-invariants in $Cl(g)$ and the Clifford algebra of the Cartan subalgebra of $g$. Second, the Cartan subalgebra is identified, via this isomorphism, with a graded space of the so-called primitive skew-symmetric invariants of $g$. This leads to a distinguished orthogonal basis of the Cartan subalgebra, which turns out to be induced from the Lie algebra Langlands dual to $g$ via the action of its principal three-dimensional subalgebra. This settles a conjecture of Kostant.

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