The integral-Tango characterization of Kodaira counterexamples

From papers

Let YY be a smooth projective surface. A counterexample to the Kodaira vanishing theorem means that Kodaira vanishing fails for YY. A fibration is a morphism with one-dimensional fibres; a singular rational curve is a singular curve whose normalization is rational. A Tango curve of integral type is the type of Tango curve specified by the source's terminology.

Integral-Tango characterization. If there is a counterexample to the Kodaira vanishing theorem on YY, then there exists a fibration

g:YCg:Y\rightarrow C

to a smooth projective curve CC such that the general fibre of gg is a singular rational curve and CC is a Tango curve of integral type.

This is presented as the converse of a theorem constructing Kodaira-vanishing counterexamples from such fibrations, and as a statement similar to the broader Tango-curve conjecture. The source gives no evidence that it has been resolved.

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Sources & referencesView supporting material

Primary source

Qihong Xie, “Counterexamples to the Kawamata-Viehweg Vanishing on Ruled Surfaces in Positive Characteristic”, arXiv:math/0702554 (2010).

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