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Homology, Homotopy and Applications
Volume 26 (2024)
Number 1
An elementary proof of the chromatic Smith fixed point theorem
Pages: 131 – 140
DOI: https://dx.doi.org/10.4310/HHA.2024.v26.n1.a8
Authors
Abstract
A recent theorem by T. Barthel, M. Hausmann, N. Naumann, T. Nikolaus, J. Noel, and N. Stapleton says that if $A$ is a finite abelian $p$-group of rank $r$, then any finite $A$-space $X$ which is acyclic in the $n$th Morava $K$-theory with $n \geqslant r$ will have its subspace $X^A$ of fixed points acyclic in the $(n-r)$th Morava Ktheory. This is a chromatic homotopy version of P. A. Smith’s classical theorem that if $X$ is acyclic in mod p homology, then so is $X^A$.
The main purpose of this paper is to give an elementary proof of this new theorem that uses minimal background, and follows, as much as possible, the reasoning in standard proofs of the classical theorem. We also give a new fixed point theorem for finite dimensional, but possibly infinite, $A\textrm{-CW}$ complexes, which suggests some open problems.
Keywords
fixed point, chromatic homotopy, Morava $K$-theory
2010 Mathematics Subject Classification
Primary 55M35. Secondary 55N20, 55P42, 55P91.
Received 3 March 2023
Accepted 24 March 2023
Published 21 February 2024