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arXiv math/9802092math.GRmath.NT
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关于局部域的正无穷pro-p-群和算术profinite扩张

On just infinite pro-p-groups and arithmetically profinite extensions of local fields

Ivan Fesenko

摘要:

野群是特征p的局部域的野自同构的群。本文应用Fontaine-Wintenberger的范数域场论研究了野群的结构。特别地,我们给出了R的一个新的简短证明.卡米纳定理,它说,每一个亲p-群与可数个开放子群是同构的一个闭子群的野生集团。研究了换位子群异常小的野群的闭子群T.将群T看作是p进域的算术有限扩张的伽罗瓦群,我们肯定地回答了关于局部域的深分歧扩张的Coates-Greenberg问题。最后利用子群T证明了在具有特征p的有限剩余域的交换完备局部Noether整环上的野群不是解析的。

英文摘要:

The wild group is the group of wild automorphisms of a local field of characteristic p. In this paper we apply Fontaine-Wintenberger's theory of fields of norms to study the structure of the wild group. In particular we provide a new short proof of R. Camina's theorem which says that every pro-p-group with countably many open sugroups is isomorphic to a closed subgroup of the wild group. We study some closed subgroups T of the wild group whose commutator subgroup is unusually small. Realizing the group T as the Galois group of arithmetically profinite extensions of p-adic fields we answer affirmatively Coates--Greenberg's problem on deeply ramified extensions of local fields. Finally using the subgroup T we show that the wild group is not analytic over commutative complete local noetherian integral domains with finite residue field of characteristic p.

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