Galois structure of the holomorphic differentials of curves

Galois structure of the holomorphic differentials of curves
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曲线全纯微分的伽罗瓦结构

DOI:
10.1016/j.jnt.2020.04.015
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发表时间:
2020
影响因子:
0.7
通讯作者:
Kontogeorgis, Aristides
Kontogeorgis, Aristides
中科院分区:
数学3区
文献类型:
--
作者:
Bleher, Frauke M.;Chinburg, Ted;Kontogeorgis, Aristides

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设X是正特征p的理想域k上的光滑射影几何不可约曲线,G是忠实作用于X的有限群,使得G具有非平凡循环Sylow p-子群。证明了X的全纯微分空间分解为不可分解的k [G]-模的直和的唯一性是由X的下分支群和在覆盖X <$X/G中分支的闭点的基本特征标决定的.当p和F是不同的奇素数且PSL(2,F <$)对模曲线X(X)模p约化的作用不是光滑分歧的时候,我们应用我们的方法确定了模曲线X(X)模p约化的全纯微分空间的PSL(2,F <$)-模结构.这提供了一些非平凡的同余模适当的极大理想之间的模形式产生的同构组件之间的作用PSL(2,F)在X()。
Let X be a smooth projective geometrically irreducible curve over a perfect field k of positive characteristic p. Suppose G is a finite group acting faithfully on X such that G has non-trivial cyclic Sylow p-subgroups. We show that the decomposition of the space of holomorphic differentials of X into a direct sum of indecomposable k [G]-modules is uniquely determined by the lower ramification groups and the fundamental characters of closed points of X that are ramified in the cover X⟶ X/G. We apply our method to determine the PSL (2, F ℓ)-module structure of the space of holomorphic differentials of the reduction of the modular curve X (ℓ) modulo p when p and ℓ are distinct odd primes and the action of PSL (2, F ℓ) on this reduction is not tamely ramified. This provides some non-trivial congruences modulo appropriate maximal ideals containing p between modular forms arising from isotypic components with respect to the action of PSL (2, F ℓ) on X (ℓ).
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