Global refinement conjecture for tempered and equivariant elliptic cohomology

From papers

Let F{\mathscr{F}} be a geometric oriented abelian sheaf over a derived stack S\mathsf{S}. Write Spfingl\operatorname{Sp}_{\mathrm{fin}-\mathrm{gl}} for the symmetric monoidal \infty-category of global spectra based on finite groups, and let

resfin ⁣:SpglSpfingl\mathrm{res}_\mathrm{fin}\colon \operatorname{Sp}_\mathrm{gl}\to\operatorname{Sp}_{\mathrm{fin}-\mathrm{gl}}

be the restriction functor. Let ΓglEllF/S\Gamma_\mathrm{gl}\mathrm{Ell}_{{\mathscr{F}}/\mathsf{S}} and ΓfinglTempF[P]/S\Gamma_{\mathrm{fin}-\mathrm{gl}}\mathrm{Temp}_{{\mathscr{F}}[\mathbf{P}^\infty]/\mathsf{S}} denote the global refinements of equivariant elliptic and tempered cohomology, respectively. Global comparison conjecture. The two E\mathbf{E}_\infty-objects in Spfingl\operatorname{Sp}_{\mathrm{fin}-\mathrm{gl}},

resfinΓglEllF/S\mathrm{res}_\mathrm{fin}\Gamma_\mathrm{gl}\mathrm{Ell}_{{\mathscr{F}}/\mathsf{S}}

and

ΓfinglTempF[P]/S,\Gamma_{\mathrm{fin}-\mathrm{gl}}\mathrm{Temp}_{{\mathscr{F}}[\mathbf{P}^\infty]/\mathsf{S}},

are naturally equivalent. This would enhance the comparison between tempered and equivariant elliptic cohomology from agreement on finite-group fixed points to an equivalence of their global finite-group refinements; the claim is presented as a conjectural refinement, and no resolution is given in the source.

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Sources & referencesView supporting material

Primary source

Jack Morgan Davies, “Comparing tempered and equivariant elliptic cohomology”, arXiv:2311.07958 (2026).

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