Strict positivity of one-form weights for conical resolutions

Let π:XY\pi:X\to Y be a conical resolution over a field of any characteristic, with

OYπOX\mathcal{O}_Y\simeq \pi_*\mathcal{O}_X

and

R1πOX=R2πOX=0.R^1\pi_*\mathcal{O}_X=R^2\pi_*\mathcal{O}_X=0.

The multiplicative group is denoted by Gm\mathbb{G}_m, and it acts on H0(X,ΩX1)H^0(X,\Omega_X^1) through the conical structure. Strict-positivity conjecture. All Gm\mathbb{G}_m-weights of H0(X,ΩX1)H^0(X,\Omega_X^1) are strictly positive. In characteristic zero, the paper proves the corresponding statement under these hypotheses; it states that no counterexamples are known in characteristic pp, which motivates the conjecture for arbitrary characteristic.

Sources & referencesView supporting material

Primary source

Dmitry Kubrak and Roman Travkin, “Resolutions with conical slices and descent for the Brauer group classes of certain central reductions of differential operators in characteristic p”, arXiv:1611.08340 (2019).

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