English

$\mathcal{E}_\infty$ ring spectra and elements of Hopf invariant $1$

Algebraic Topology 2017-04-18 v8

Abstract

The 22-primary Hopf invariant 11 elements in the stable homotopy groups of spheres form the most accessible family of elements. In this paper we explore some properties of the E\mathcal{E}_\infty ring spectra obtained from certain iterated mapping cones by applying the free algebra functor. In fact, these are equivalent to Thom spectra over infinite loop spaces related to the classifying spaces BSO,BSpin,BStringB\mathrm{SO},\,B\mathrm{Spin},\,B\mathrm{String}. We show that the homology of these Thom spectra are all extended comodule algebras of the form AA(r)P\mathcal{A}_*\square_{\mathcal{A}(r)_*}P_* over the dual Steenrod algebra A\mathcal{A}_* with AA(r)F2\mathcal{A}_*\square_{\mathcal{A}(r)_*}\mathbb{F}_2 as an algebra retract. This suggests that these spectra might be wedges of module spectra over the ring spectra HZH\mathbb{Z}, kOk\mathrm{O} or tmf\mathrm{tmf}, however apart from the first case, we have no concrete results on this.

Keywords

Cite

@article{arxiv.1503.05902,
  title  = {$\mathcal{E}_\infty$ ring spectra and elements of Hopf invariant $1$},
  author = {Andrew Baker},
  journal= {arXiv preprint arXiv:1503.05902},
  year   = {2017}
}

Comments

Final published version with corrections; appeared in a memorial volume dedicated to Sam Gitler, Boletin de la Sociedad Matematica Mexicana 23 (2017), 195-231

R2 v1 2026-06-22T08:57:32.652Z