English

Eilenberg Mac Lane spectra as p-cyclonic Thom spectra

Algebraic Topology 2021-10-26 v2

Abstract

Hopkins and Mahowald gave a simple description of the mod pp Eilenberg Mac Lane spectrum Fp\mathbb{F}_p as the free E2\mathbb{E}_2-algebra with an equivalence of pp and 00. We show for each faithful 22-dimensional representation λ\lambda of a pp-group GG that the GG-equivariant Eilenberg Mac Lane spectrum Fp\underline{\mathbb{F}}_p is the free Eλ\mathbb{E}_{\lambda}-algebra with an equivalence of pp and 00. This unifies and simplifies recent work of Behrens, Hahn, and Wilson, and extends it to include the dihedral 22-subgroups of O(2). The main new idea is that Fp\underline{\mathbb{F}}_p has a simple description as a pp-cyclonic module over THH(Fp)\rm{THH}(\mathbb{F}_p). We show our result is the best possible one in that it gives all groups GG and representations VV such that Fp\underline{\mathbb{F}}_p is the free EV\mathbb{E}_V-algebra with an equivalence of pp and 00.

Keywords

Cite

@article{arxiv.2103.04457,
  title  = {Eilenberg Mac Lane spectra as p-cyclonic Thom spectra},
  author = {Ishan Levy},
  journal= {arXiv preprint arXiv:2103.04457},
  year   = {2021}
}

Comments

Revised in response to referee feedback. 19 pages

R2 v1 2026-06-23T23:51:28.657Z