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arXiv math/0411105math.RTmath.AG
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关于U(sl_n)的两种尺规作图法及其表示

On two geometric constructions of U(sl_n) and its representations

Alistair Savage

摘要:

Ginzburg和Nakajima分别利用flag簇和narrow簇的Borel-Moore同调中的卷积积给出了sl_n的泛包络代数的子代数及其不可约有限维最高权表示的两种不同的尺规作图法.本文的目的是解释这两种结构之间的确切关系。特别是,我们表明,虽然这两个产生不同的代数的泛包络代数,他们产生相同的表示和自然基础,在这两个建设是相同的。我们还研究了这种关系如何可以用来翻译的晶体结构上的不可约组件的Kashiwara和齐藤品种,定义的晶体结构上出现在金斯堡的建设品种,从而恢复马尔金的结果。

英文摘要:

Ginzburg and Nakajima have given two different geometric constructions of quotients of the universal enveloping algebra of sl_n and its irreducible finite-dimensional highest weight representations using the convolution product in the Borel-Moore homology of flag varieties and quiver varieties respectively. The purpose of this paper is to explain the precise relationship between the two constructions. In particular, we show that while the two yield different quotients of the universal enveloping algebra, they produce the same representations and the natural bases which arise in both constructions are the same. We also examine how this relationship can be used to translate the crystal structure on irreducible components of quiver varieties, defined by Kashiwara and Saito, to a crystal structure on the varieties appearing in Ginzburg's construction, thus recovering results of Malkin.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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