Reflexive differential nonvanishing conjecture

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Let XX be a normal projective variety with klt singularities, and let 1≤q≤dim⁡X1\leq q\leq\dim X. Write ΩX[q]\Omega^{[q]}_X for the sheaf of reflexive holomorphic differentials in degree qq, and write S[m]ΩX[q]S^{[m]}\Omega^{[q]}_X for its reflexive mmth symmetric power. A coherent sheaf is pseudoeffective in the sense of the paper's definition.

Reflexive differential nonvanishing conjecture. The sheaf ΩX[q]\Omega^{[q]}_X is pseudoeffective if and only if there exists a positive integer mm such that

H0(X,S[m]ΩX[q])≠0.H^0\left(X,S^{[m]}\Omega^{[q]}_X\right)\ne 0.

This extends the cotangent-bundle nonvanishing prediction from smooth projective manifolds to reflexive differentials on klt varieties. Its general status is not resolved in the supplied text.

References

Primary source

Andreas Höring and Thomas Peternell, “A Nonvanishing Conjecture for Cotangent Bundles”, arXiv:2006.05225 (2020).

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