The generalized test-ideal and multiplier-ideal reduction conjecture for singular varieties

Let XX be a normal variety over a field kk of characteristic zero, let Δ\Delta be a Q\mathbb{Q}-divisor such that KX+ΔK_X+\Delta is Q\mathbb{Q}-Cartier, and let a\mathfrak{a} be a nonzero ideal on XX. Given a model of (X,Δ,a)(X,\Delta,\mathfrak{a}) over a finitely generated Z\mathbb{Z}-subalgebra AA of kk, the generalized test-ideal and multiplier-ideal reduction conjecture. There exists a Zariski-dense set of closed points SSpecAS \subseteq \operatorname{Spec} A such that

τ(Xs,Δs,asλ)=J(X,Δ,aλ)s\tau(X_s,\Delta_s,\mathfrak{a}_s^{\lambda})=\mathcal{J}(X,\Delta,\mathfrak{a}^{\lambda})_s

for all λR0\lambda \in \mathbb{R}_{\geq 0} and all sSs \in S. Furthermore, for finitely many such triples and corresponding models over AA, there is a dense subset of closed points for which the equality holds for every triple. This generalizes the smooth-variety conjecture by allowing singular XX and a boundary divisor. The supplied text gives no resolution evidence, so the conjecture is recorded as open.

Sources & referencesView supporting material

Primary source

Bhargav Bhatt, Karl Schwede and Shunsuke Takagi, “The weak ordinarity conjecture and F-singularities”, arXiv:1307.3763 (2016).

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