Gaitsgory's factorization conjecture for local systems on the formal punctured disc

Let GG be a reductive group and let DD^{\circ} be the formal punctured disc. Write LocSysG(D)\operatorname{LocSys}_G(D^{\circ}) for the stack of GG-local systems on DD^{\circ}, and let Rep(G)\operatorname{Rep}(G) denote the symmetric monoidal DG category of representations of GG. Let ModCat\mathbf{ModCat} be the (,2)(\infty,2)-category of module categories and let FactModCat\mathbf{FactModCat} denote the corresponding category of factorization module categories.

Gaitsgory's factorization conjecture. There exists a fully faithful functor

\bFact:QCoh(LocSysG(D))ModCatRep(G)FactModCat\bFact: \operatorname{QCoh}(\operatorname{LocSys}_G(D^{\circ}))\mathbf{-ModCat} \longrightarrow \operatorname{Rep}(G)\mathbf{-FactModCat}

that is compatible with the forgetful functors from both sides to DGCat\mathbf{DGCat}. On the left, QCoh(LocSysG(D))\operatorname{QCoh}(\operatorname{LocSys}_G(D^{\circ})) is viewed as a monoidal category with its usual tensor product, and the left-hand side is the (,2)(\infty,2)-category of modules for this monoidal category. On the right, Rep(G)\operatorname{Rep}(G) is equipped with its factorization-algebra category structure induced by its symmetric monoidal structure.

This conjecture gives a factorization-theoretic categorical incarnation of the local geometric Langlands perspective and relates categorical representations to local systems with restricted variation. The paper presents it as a conjectural structural statement; its resolution status is not specified in the supplied text.

Sources & referencesView supporting material

Primary source

Ekaterina Bogdanova, “Local systems with restricted variation on the formal punctured disc via factorization”, arXiv:2411.05297 (2024).

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