The ULA module characterization conjecture for local systems

Let \sG\sG be an algebraic group, let XX be a smooth proper curve, and set \CA=\Rep(\sG)\CA=\Rep(\sG). Let \LocSys\sG(X)\LocSys_{\sG}(X) be the stack of de Rham \sG\sG-local systems on XX. The canonical functor

\onFact(\Rep(\sG))\Ran(X)\QCoh(\LocSys\sG(X))\on{Fact}(\Rep(\sG))_{\Ran(X)}\to \QCoh(\LocSys_{\sG}(X))

induces a fully faithful functor

\QCoh(\LocSys\sG(X))\mmod\onc.g.\CAX\mmod\onc.g..\QCoh(\LocSys_{\sG}(X))\mmod^{\on{c.g.}}\to \CA^{\otimes X}\mmod^{\on{c.g.}}.

ULA module characterization conjecture. This functor induces an equivalence onto

\CAX\mmod\onULA\CAX\mmod\onc.g..\CA^{\otimes X}\mmod^{\on{ULA}}\subset \CA^{\otimes X}\mmod^{\on{c.g.}}.

The proposition immediately before the conjecture establishes one containment, so the conjecture asserts that every compactly generated ULA module arises from \QCoh(\LocSys\sG(X))\QCoh(\LocSys_{\sG}(X)); the source gives no resolution.

Sources & referencesView supporting material

Primary source

D. Gaitsgory, D. Kazhdan, N. Rozenblyum and Y. Varshavsky, “A toy model for the Drinfeld-Lafforgue shtuka construction”, arXiv:1908.05420 (2022).

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