The adjoint-test ideal correspondence conjecture along a subvariety

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Let (R,m)(R,\mathfrak{m}) be a regular local ring essentially of finite type over a perfect field of prime characteristic pp, and let I⊆RI \subseteq R be a nonzero unmixed ideal. Let a‾t‾=∏i=1maiti\underline{\mathfrak{a}}^{\underline{t}}=\prod_{i=1}^m \mathfrak{a}_i^{t_i} be a formal combination, where the ai\mathfrak{a}_i are ideals of RR such that ai∩R∘,I≠∅\mathfrak{a}_i \cap R^{\circ, I} \ne \emptyset and the tit_i are positive real numbers. Set A:=Spec⁡RA:=\operatorname{Spec} R, X:=V(I)X:=V(I) and Y:=∑i=1mtiV(ai)Y:=\sum_{i=1}^m t_i V(\mathfrak{a}_i). Assume that (R,I,a‾)(R,I,\underline{\mathfrak{a}}) is reduced from characteristic zero to characteristic p≫0p \gg 0, together with a log resolution π:A~→A\pi:\widetilde{A} \to A of (A,X+Y)(A,X+Y) used to define the adjoint ideal sheaf adj⁡X(A,Y)\operatorname{adj}_X(A,Y). Adjoint-test ideal correspondence conjecture. Then

adj⁡X(A,Y)=τ~I(R,a‾t‾).\operatorname{adj}_X(A,Y)=\widetilde{\tau}_{I}(R,\underline{\mathfrak{a}}^{\underline{t}}).

This conjecture predicts that the generalized test ideal along II agrees with the adjoint ideal sheaf after reduction from characteristic zero. The paper establishes partial results toward this correspondence, while the full assertion is not established in the supplied text.

References

Primary source

Shunsuke Takagi, “Adjoint ideals along closed subvarieties of higher codimension”, arXiv:0711.2342 (2008).

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