Ramification of a finite flat group scheme over a local field

Ramification of a finite flat group scheme over a local field
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有限平坦群方案在局部域上的衍生

DOI:
10.1016/j.jnt.2005.08.006
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发表时间:
2006
影响因子:
0.7
通讯作者:
Shin Hattori
Shin Hattori
中科院分区:
数学3区
文献类型:
--
作者:
Shin Hattori

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本文研究了具有混合特征(0,p)的完全离散赋值域的整数环上有限平坦群格式的Abbes-Saito意义下的分歧.我们推断,它的伽罗瓦表示只取决于它的减少模显式计算的p-功率。我们还对方丹关于有限平坦Galois表示的分歧的一个定理给出了新的证明,并将其推广到剩余域可能是不完全的情形。
In this paper, we analyze ramification in the sense of Abbes–Saito of a finite flat group scheme over the ring of integers of a complete discrete valuation field of mixed characteristic (0,p). We deduce that its Galois representation depends only on its reduction modulo explicitly computed p-power. We also give a new proof of a theorem of Fontaine on ramification of a finite flat Galois representation, and extend it to the case where the residue field may be imperfect.