English

Comparing tempered and equivariant elliptic cohomology

Algebraic Topology 2025-02-19 v2 Algebraic Geometry K-Theory and Homology

Abstract

Lurie and Gepner--Meier each define equivariant cohomology theories, namely \emph{tempered cohomology} and \emph{equivariant elliptic cohomology}, respectively, using derived algebraic geometry. We construct a natural equivalence between these theories where they overlap. Moreover, we emphasise the naturality and coherence of both these equivariant theories as well as our comparison. To demonstrate the use of this comparison, we show that the GG-fixed points of equivariant topological modular forms is dualisable as a TMF\mathrm{TMF}-module for all compact Lie groups GG that decompose as a product of a torus and a finite group by formally reducing to an argument of Gepner--Meier.

Keywords

Cite

@article{arxiv.2311.07958,
  title  = {Comparing tempered and equivariant elliptic cohomology},
  author = {Jack Morgan Davies},
  journal= {arXiv preprint arXiv:2311.07958},
  year   = {2025}
}

Comments

26 pages, comments welcome, v2 generalises the set-up of abelian varieties to abelian sheaves and refines Conj.0.1

R2 v1 2026-06-28T13:20:26.474Z