The uniform reduction conjecture for test and multiplier ideals

Let aZ[x1,,xn]\mathfrak{a}\subset{\mathbf Z}[x_1,\ldots,x_n] be an ideal as above, let ap\mathfrak{a}_p be its reduction modulo pp, and let τ(apλ)\tau(\mathfrak{a}_p^\lambda) and J(aλ)p\mathcal{J}(\mathfrak{a}^\lambda)_p denote the corresponding test ideal and reduced multiplier ideal. Uniform reduction conjecture. There is an infinite set of primes SS such that

τ(apλ)=J(aλ)p\tau(\mathfrak{a}_p^\lambda)=\mathcal{J}(\mathfrak{a}^\lambda)_p

for every λR0\lambda\in{\mathbf R}_{\geq 0} and every pSp\in S. This strengthens the threshold-equality conjecture; Hara–Yoshida proved equality for each fixed λ\lambda and all sufficiently large primes, but the source does not give a resolution of the simultaneous assertion.

Sources & referencesView supporting material

Primary source

Mircea Mustata, “IMPANGA lecture notes on log canonical thresholds”, arXiv:1107.2676 (2011).

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