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arxiv: 1810.01695 · v1 · pith:VZ72NNLZnew · submitted 2018-10-03 · 🧮 math.NT

Honda formal group as Galois module in unramified extensions of local fields

classification 🧮 math.NT
keywords groupextensionsgaloismathcalmathfrakunramifiedextensionfields
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For given rational prime number $p$ consider the tower of finite extensions of fields $K_0/\mathbb{Q}_p,$ $K/K_0, L/K, M/L$, where $K/K_0$ is unramified and $M/L$ is a Galois extension with Galois group $G$. Suppose one dimensional Honda formal group over the ring $\mathcal{O}_K$, relative to the extension $K/K_0$ and uniformizer $\pi\in K_0$ is given. The operation $x\underset{F}+y=F(x,y)$ sets a new structure of abelian group on the maximal ideal $\mathfrak{p}_M$ of the ring $\mathcal{O}_M$ which we will denote by $F(\mathfrak{p}_M)$. In this paper the structure of $F(\mathfrak{p}_M)$ as $\mathcal{O}_{K_0}[G]$-module is studied for specific unramified $p$-extensions $M/L$.

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