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arXiv 1809.02258math.RTmath.AG
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表示的Gelfand-Tsetlin退化与旗簇

Gelfand--Tsetlin degenerations of representations and flag varieties

Igor Makhlin

摘要:

我们的主要目标是表明,Gelfand-Tsetlin复曲面退化的A型旗品种可以得到一个退化的表示理论框架内类似的PBW退化的理论。事实上,我们提供了这样的框架之间的旗品种和GT复曲面品种中间的所有Gröbner退化。这些退化被证明会导致不可约表示上的过滤,并且相关的分次空间受到某种结合代数的作用。为了实现我们的目标,我们构造嵌入我们的Gröbner退化到投影说,相关的分次空间在这个行动。我们还得到了一个明确的描述,参数化的Gröbner退化,我们认为在热带旗品种的最大锥。在附录中,我们提出了一个替代解决方案的问题,依赖于过滤和分级的非阿贝尔有序半群。

英文摘要:

Our main goal is to show that the Gelfand--Tsetlin toric degeneration of the type A flag variety can be obtained within a degenerate representation-theoretic framework similar to the theory of PBW degenerations. In fact, we provide such frameworks for all Gröbner degenerations intermediate between the flag variety and the GT toric variety. These degenerations are shown to induce filtrations on the irreducible representations and the associated graded spaces are acted upon by a certain associative algebra. To achieve our goal, we construct embeddings of our Gröbner degenerations into the projectivizations of said associated graded spaces in terms of this action. We also obtain an explicit description of the maximal cone in the tropical flag variety that parametrizes the Gröbner degenerations we consider. In an addendum we propose an alternative solution to the problem which relies on filtrations and gradings by non-abelian ordered semigroups.

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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