Extension and compatibility conjecture for equivariant homology of spectra

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Let GG be a finite group. Write StHom⁡naive(G)\operatorname{\sf StHom}^{naive}(G) and StHom⁡(G)\operatorname{\sf StHom}(G) for the categories of naive and genuine GG-spectra, respectively, and let i!i_! be the tautological functor between them. Let hnaiveGh^G_{naive} and hGh^G be the naive and equivariant homology functors, let q!oppq^{opp}_! be the indicated functor between the derived categories of coefficient systems and derived Mackey functors, and let ΦH\Phi^H and Φ[G/H]\Phi^{[G/H]} denote the geometric fixed-point functors on spectra and derived Mackey functors, respectively. Extension and compatibility conjecture. The functors hGh^G and hnaiveGh^G_{naive} extend to the categories of spectra so that the diagram

StHom⁡naive(G)→i!StHom⁡(G)hnaiveG↓↓hGD(OGopp,Z-mod)→q!oppDM(G)\begin{CD} \operatorname{\sf StHom}^{naive}(G) @>{i_!}>> \operatorname{\sf StHom}(G)\\ @V{h^G_{naive}}VV @VV{h^G}V\\ {\cal D}(O_G^{opp},{\mathbb Z}{\text{-mod}}) @>{q^{opp}_!}>> {\cal D}{\cal M}(G) \end{CD}

is a commutative diagram of tensor triangulated functors. Moreover, for every subgroup H⊂GH\subset G, there is an isomorphism of functors

Φ[G/H]∘hG(X)≅h∘ΦH(X)\Phi^{[G/H]}\circ h^G(X)\cong h\circ\Phi^H(X)

from StHom⁡(G)\operatorname{\sf StHom}(G) to D(Z-mod){\cal D}({\mathbb Z}{\text{-mod}}). The conjecture extends the finite-spectrum compatibility to all spectra and predicts compatibility with geometric fixed points; the source provides no evidence of resolution, so its status remains open.

References

Primary source

D. Kaledin, “Derived Mackey functors”, arXiv:0812.2519 (2010).

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