Finite local systems in the Drinfeld-Laumon construction
Algebraic Geometry
2018-08-23 v1
Abstract
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}, ...
Keywords
Cite
@article{arxiv.1808.07085,
title = {Finite local systems in the Drinfeld-Laumon construction},
author = {Galyna Dobrovolska},
journal= {arXiv preprint arXiv:1808.07085},
year = {2018}
}