The cut-by-curves conjecture for overconvergent F-isocrystals

Let XX be a variety, let YY be a boundary or compactification datum, and let CC denote a curve contained in the indicated variety. Write FIsoc(X)\operatorname{\mathbf{F-Isoc}}(X) and FIsoc(X,Y)\operatorname{\mathbf{F-Isoc}}(X,Y) for the convergent categories with and without the boundary structure, and FIsoc(X)\operatorname{\mathbf{F-Isoc}}^\dagger(X) for the overconvergent category. Cut-by-curves conjecture. An object of FIsoc(X)\operatorname{\mathbf{F-Isoc}}(X) extends to FIsoc(X,Y)\operatorname{\mathbf{F-Isoc}}(X,Y) if and only if, for every curve CYC \subseteq Y, its pullback to FIsoc(C×YX)\operatorname{\mathbf{F-Isoc}}(C \times_Y X) extends to FIsoc(C×YX,C)\operatorname{\mathbf{F-Isoc}}(C \times_Y X,C). In particular, an object of FIsoc(X)\operatorname{\mathbf{F-Isoc}}(X) extends to FIsoc(X)\operatorname{\mathbf{F-Isoc}}^\dagger(X) if and only if, for every curve CXC \subseteq X, its pullback to FIsoc(C)\operatorname{\mathbf{F-Isoc}}(C) extends to FIsoc(C)\operatorname{\mathbf{F-Isoc}}^\dagger(C). This is known for unit-root objects, while weaker results require the underlying connection to extend to a strict neighborhood.

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Primary source

Kiran S. Kedlaya, “Notes on isocrystals”, arXiv:1606.01321 (2022).

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