Roots of unity in 𝐾(𝑛)-local rings

Author:

Devalapurkar Sanath

Abstract

The goal of this paper is to address the following question: if A A is an E k \mathbf {E}_{k} -ring for some k 1 k\geq 1 and f : π 0 A B f\colon \pi _0 A \to B is a map of commutative rings, when can we find an E k \mathbf {E}_{k} -ring R R with an E k \mathbf {E}_{k} -ring map g : A R g\colon A \to R such that π 0 g = f \pi _0 g = f ? A classical result in the theory of realizing E \mathbf {E}_\infty -rings, due to Goerss–Hopkins, gives an affirmative answer to this question if f f is étale. The goal of this paper is to provide answers to this question when f f is ramified. We prove a non-realizability result in the K ( n ) K(n) -local setting for every n 1 n\geq 1 for H H_\infty -rings containing primitive p p th roots of unity. As an application, we give a proof of the folk result that the Lubin–Tate tower from arithmetic geometry does not lift to a tower of H H_\infty -rings over Morava E E -theory.

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

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