On non-vanishing of cohomologies of generalized Raynaud polarized surfaces

Details On non-vanishing of cohomologies of generalized Raynaud polarized surfaces On non-vanishing of cohomologies of generalized Raynaud polarized surfaces

2008-05-05

arxiv.org/abs/0805.0524v4

Mathematics

Algebraic Geometry

Previous version has been largely revised. In particular, we consider the Mumford-Szpiro type polarization, which is more natu

Scientific paper

We consider a family of slightly extended version of the Raynaud's surfaces X over the field of positive characteristic with Mumford-Szpiro type polarizations Z, which have Kodaira non-vanishing H^1(X, Z^{-1})\ne 0. The surfaces are at least normal but smooth under a special condition. We compute the cohomologies H^i(X, Z^n), for intergers i and n, and study their (non-)vanishing. Finally, we give a fairly large family of non Mumford-Szpiro type polarizations Z_{a,b} with Kodaira non-vanishing.

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