Singular components of the Springer fiber in the two-columns case

Singular components of the Springer fiber in the two-columns case
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两柱情况下施普林格纤维的单一成分

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发表时间:
2008
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通讯作者:
Lucas Fresse
Lucas Fresse
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文献类型:
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作者:
Lucas Fresse

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我们考虑了施普林格纤维${\数学B}_u$对应于幂零阶2的幂零自同态$u$。作为第一个结果,我们给出了${\mathcal B}_u$的给定分量的元素的描述,这些元素是由标准环面相对于$u$的约旦基的作用所固定的。利用这一结果,我们建立了${\mathcal B}_u$的分量奇异的充分必要条件。
We consider the Springer fiber ${\mathcal B}_u$ corresponding to a nilpotent endomorphism $u$ of nilpotent order 2. As a first result, we give a description of the elements of a given component of ${\mathcal B}_u$ which are fixed by the action of the standard torus relative to some Jordan basis of $u$. By using this result, we establish a necessary and sufficient condition of singularity for the components of ${\mathcal B}_u$.