Bogomolov-Sommese vanishing for log canonical varieties

Let (Z,Δ)(Z,\Delta) be a logarithmic pair, with ZZ a variety and Δ\Delta a boundary divisor, and assume that (Z,Δ)(Z,\Delta) is log canonical. Let ΩZ[p](logΔ)\Omega_Z^{[p]}(\log\Delta) denote the reflexive sheaf of logarithmic pp-forms, and let AΩZ[p](logΔ)\mathscr A\subseteq\Omega_Z^{[p]}(\log\Delta) be a reflexive subsheaf of rank one. Assume that A\mathscr A is Q\mathbb Q-Cartier. Bogomolov-Sommese vanishing for log canonical varieties. Then

κ(A)p.\kappa(\mathscr A)\leq p.

This is the expected extension of Bogomolov-Sommese vanishing from simple normal crossing pairs to log canonical pairs. It was verified under the additional assumption dimZ3\dim Z\leq 3 in the cited work of Greb, Kebekus and Kovács, so the general statement remains open.

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Primary source

Stefan Kebekus and Sandor J. Kovacs, “The structure of surfaces and threefolds mapping to the moduli stack of canonically polarized varieties”, arXiv:0812.2305 (2008).

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