Galois descent and twists of an abelian variety

Galois descent and twists of an abelian variety
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伽罗瓦血统和阿贝尔簇的扭曲

DOI:
10.4064/aa-73-1-51-57
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发表时间:
1995
期刊:
影响因子:
0.7
通讯作者:
Masanari Kida
Masanari Kida
中科院分区:
数学3区
文献类型:
--
作者:
Masanari Kida

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介绍。描述阿贝尔簇的 Mordell-Weil 群在域扩展中的行为是非常有趣的,许多数学家都在研究这个问题(例如,参见 Honda [2] 和 Ono [7])。最近,A. Sato [9] 获得了具有某些复数乘法的阿贝尔簇的一般结果(第 2 节中的推论)。在本文中,我们将证明一个定理(第 2 节中的定理),佐藤的结果由此得出。粗略地说,我们的定理描述了伽罗瓦下降和扭曲之间的关系(参见第 1 节的定义),并且可以被认为是佐藤定理的几何对应物。我们将在本文中使用以下符号。对于数域 k,可分离闭包用 ks 表示,并且我们假设 k 的所有代数扩展都位于 ks 中。设 A 是在 k 上定义的阿贝尔簇。对于 k 的任何有限扩展 K,我们设置:
Introduction. It is very interesting to describe the behavior of the Mordell–Weil group of an abelian variety in a field extension and many mathematicians study this problem (for instance, see Honda [2] and Ono [7]). Recently, A. Sato [9] obtained a general result for abelian varieties with certain complex multiplication (the corollaries in Section 2). In this paper, we shall prove a theorem (Theorem in Section 2), from which Sato’s results follow. Roughly speaking, our theorem describes the relation between the Galois descent and twists (see Section 1 for their definitions) and can be considered as a geometric counterpart of Sato’s. We will use the following notation throughout this paper. For a number field k, the separable closure is denoted by ks and we assume that all algebraic extensions of k lie in ks. Let A be an abelian variety defined over k. We set, for any finite extension K of k,
DOI: 10.1007/bf01425446
发表时间: 1972-09
影响因子: 3.1
作者:
J. Milne
通讯作者: J. Milne