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arXiv 1307.7634math.AGmath.RT
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旗簇的退化坐标环与Frobenius分裂

Degenerate coordinate rings of flag varieties and Frobenius splitting

Chuck Hague

摘要:

最近E. Feigin介绍了半单代数群的$\mathbb G_a^N$ -退化及其相关的退化旗簇。Feigin、Finkelberg和Littelmann已经证明,类型$A_n$和$C_n$的退化旗型变种是Frobenius分裂的。本文构造了所有类型的经典旗簇的齐次坐标环的伴随退化,并证明了这些环在大多数类型下是Frobenius分裂的。因此,退化旗型品种$A_n$、$C_n$和$G_2$是Frobenius分裂型。特别是,我们得到了另一个证明分裂类型$A_n$和$C_n$ ;情况$G_2$是以前不知道的。我们还给出了PBW-分次版本的Weyl模的一个表示论条件,它等价于经典标志簇的Frobenius分裂的存在,最大限度地兼容分裂的身份。

英文摘要:

Recently E. Feigin introduced the $\mathbb G_a^N$-degenerations of semisimple algebraic groups and their associated degenerate flag varieties. It has been shown by Feigin, Finkelberg, and Littelmann that the degenerate flag varieties in types $A_n$ and $C_n$ are Frobenius split. In this paper we construct an associated degeneration of homogeneous coordinate rings of classical flag varieties in all types and show that these rings are Frobenius split in most types. It follows that the degenerate flag varieties of types $A_n$, $C_n$ and $G_2$ are Frobenius split. In particular we obtain an alternate proof of splitting in types $A_n$ and $C_n$; the case $G_2$ was not previously known. We also give a representation-theoretic condition on PBW-graded versions of Weyl modules which is equivalent to the existence of a Frobenius splitting of the classical flag variety that maximally compatibly splits the identity.

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