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arXiv 1808.07085math.AG
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Drinfeld-Laumon构造中的有限局部系统

Finite local systems in the Drinfeld-Laumon construction

Galyna Dobrovolska

摘要:

设E是亏格为g的光滑射影曲线上的局部系统,其单值性由对应于行长为n_1,n_2,.的Young图的对称群的表示给出.其中n_1 > n_2 +(2g-2),n_2 > n_3 +(2g-2),.,n_{k-1} > n_k +(2g-2),n_k > n_{k+1} + n_{k+2} +. + (2g-2)。我们证明了应用于E的Drinfeld-Laumon构造的k步的结果是Harder-Narasimhan地层的IC层,其子层的秩为1,度为n_1,n_2,.,n_k,n_{k+1} + n_{k+2} +..具有由具有行n_{k+1}、n_{k+2}、.的Young图给出的单值的局部系统中的系数。

英文摘要:

Let E be a local system on a smooth projective curve of genus g with monodromy given by a representation of the symmetric group corresponding to a Young diagram with rows of lengths n_1,n_2,... where n_1 > n_2 + (2g-2), n_2 > n_3 + (2g-2), ..., n_{k-1} > n_k + (2g-2), n_k > n_{k+1} + n_{k+2} + ... + (2g-2). We show that the result of k steps of the Drinfeld-Laumon construction applied to E is the IC sheaf of the Harder-Narasimhan stratum with subquotients of rank 1 and degrees n_1, n_2, ..., n_k, n_{k+1}+n_{k+2}+... with coefficients in a local system with monodromy given by the Young diagram with rows n_{k+1}, n_{k+2}, ...

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