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arXiv 1005.3147math.NT
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范域的Galois形变理论与平坦形变环

Galois deformation theory for norm fields and flat deformation rings

Wansu Kim

摘要:

设$K$是$\mathbb{Q}_p$的有限扩张,选择一个均匀化器$π\in K$,并将$K_\infty:=K(\sqrt[p^\infty]π)$。本文介绍了一种利用对$\Gal(\ol K/K_\infty)$的约束来研究平面变形环的新方法。我们证明了对于任意正整数$h$,$\Gal(\ol K/K_\infty)$-表示“高度为$\leqslant h$”的变形环的存在性,并利用它们给出了Kisin关于平坦变形环的连通分量分析的证明的一个变体,Kisin的连通分量分析用于证明Kisin关于潜在Barsotti-Tate表示的模提升定理.我们的证明没有使用有限平坦群格式的分类,因此避免了Zink的窗口理论,并在$p=2$时显示。这种$\Gal(\ol K/K_\infty)$ -变形理论在Genestier-Lafforgue意义上的晶体表象的正特性模拟中具有良好的模拟。特别是,我们得到了一个正的特征模拟的结晶变形环,并可以分析其局部结构。

英文摘要:

Let $K$ be a finite extension of $\mathbb{Q}_p$, and choose a uniformizer $π\in K$, and put $K_\infty:=K(\sqrt[p^\infty]π)$. We introduce a new technique using restriction to $\Gal(\ol K/K_\infty)$ to study flat deformation rings. We show the existence of deformation rings for $\Gal(\ol K/K_\infty)$-representations ``of height $\leqslant h$'' for any positive integer $h$, and we use them to give a variant of Kisin's proof of connected component analysis of a certain flat deformation rings, which was used to prove Kisin's modularity lifting theorem for potentially Barsotti-Tate representations. Our proof does not use the classification of finite flat group schemes, so it avoids Zink's theory of windows and displays when $p=2$. This $\Gal(\ol K/K_\infty)$-deformation theory has a good analogue in positive characteristics analogue of crystalline representations in the sense of Genestier-Lafforgue. In particular, we obtain a positive characteristic analogue of crystalline deformation rings, and can analyze their local structure.

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