Moduli of formal A-modules under change of A

Details Moduli of formal A-modules under change of A Moduli of formal A-modules under change of A

2010-04-28

arxiv.org/abs/1004.4941v4

Mathematics

Algebraic Topology

Scientific paper

If $A$ is the localization at $p$ or completion at $p$ of a number ring, there exists a Hopf algebroid $(L^A,L^AB)$ classifying one-dimensional formal $A$-module laws, and a Hopf algebroid $(V^A,V^AT)$ classifying one-dimensional $A$-typical formal $A$-module laws. In the paper "Structure of the moduli stack of one-dimensional formal $A$-modules" we describe some of the structure of these Hopf algebroids; in the present paper we describe what happens to the Hopf algebroids $(L^A,L^AB)$ and $(V^A,V^AT)$ (or equivalently, the moduli stack of one-dimensional formal $A$-modules), and their cohomology, when we change the number ring $A$. Most importantly, whenever $K/\mathbb{Q}_p$ is not wildly ramified and $A$ is the ring of integers in $K$, we provide formulas for the formal $A$-module Morava stabilizer algebras as quotient Hopf algebras of the classical Morava stabilizer algebras. In future works these formulas will be used to make computations of the cohomology of Morava stabilizer groups of large height.

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