The equivariant infinity-category construction conjecture

Let GG be a smooth algebraic group and let XX be a left GG-variety over SpecK\operatorname{Spec} K. Let Ner(SfReslG(X)op)\mathsf{Ner}(\operatorname{\mathbf{SfResl}}_G(X)^{\operatorname{op}}) be the simplicial nerve of SfReslG(X)op\operatorname{\mathbf{SfResl}}_G(X)^{\operatorname{op}}, and let FF be a pre-equivariant \infty-pseudofunctor on XX, namely an \infty-functor

F:Ner(SfReslG(X)op)Nerhc(QCat).F:\mathsf{Ner}(\operatorname{\mathbf{SfResl}}_G(X)^{\operatorname{op}})\to\mathsf{Ner}_{\operatorname{hc}}(\mathfrak{QCat}).

For ΓSf(G)0\Gamma\in\operatorname{\mathbf{Sf}}(G)_0, write ΓX\,_{\Gamma}{\mathnormal{X}} for the corresponding variety, and for fSf(G)1f\in\operatorname{\mathbf{Sf}}(G)_1 write f\overline{\mathnormal{f}} for its induced map. The equivariant infinity-category construction conjecture. To FF there is an associated equivariant \infty-category FG(X)F_G(X) whose 00-cells are pairs (A,TA)(A,T_A), where

A={ΓA}ΓSf(G)0A=\lbrace\,_{\Gamma}{\mathnormal{A}}\,\rbrace_{\Gamma\in\operatorname{\mathbf{Sf}}(G)_0}

with each ΓA\,_{\Gamma}{\mathnormal{A}} a 00-cell of F(ΓX)F(\,_{\Gamma}{\mathnormal{X}}), and

TA={τfA:F(f)(ΓA)ΓA}fSf(G)1,T_A=\lbrace\tau_f^A:F(\overline{\mathnormal{f}})(\,_{\Gamma^{\prime}}{\mathnormal{A}})\xrightarrow{\simeq}\,_{\Gamma}{\mathnormal{A}}\rbrace_{f\in\operatorname{\mathbf{Sf}}(G)_1},

subject to a higher cocycle condition involving fillers of the desired diagrams. This would provide the missing rigorous construction of the equivariant \infty-category, from which equivariant derived \infty-categories and equivariant \infty-categories of perverse sheaves can be obtained. The supplied text gives no evidence that the conjecture has been resolved.

Sources & referencesView supporting material

Primary source

Geoff Vooys, “Equivariant Functors and Sheaves”, arXiv:2110.01130 (2023).

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