The adjoint-test ideal correspondence conjecture along a subvariety

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 IRI \subseteq R be a nonzero unmixed ideal. Let at=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 aiR,I\mathfrak{a}_i \cap R^{\circ, I} \ne \emptyset and the tit_i are positive real numbers. Set A:=SpecRA:=\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 p0p \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 adjX(A,Y)\operatorname{adj}_X(A,Y). Adjoint-test ideal correspondence conjecture. Then

adjX(A,Y)=τ~I(R,at).\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.

Sources & referencesView supporting material

Primary source

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

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.