Non-classical Godeaux Surfaces

Details Non-classical Godeaux Surfaces Non-classical Godeaux Surfaces

2008-04-21

arxiv.org/abs/0804.3353v2

Math. Ann. 343, 623-637 (2009)

Mathematics

Algebraic Geometry

13 pages, some minor mistakes corrected

Scientific paper

A non-classical Godeaux surface is a minimal surface of general type with $\chi=K^2=1$ but with $h^{01}\neq0$. We prove that such surfaces fulfill $h^{01}=1$ and they can exist only over fields of positive characteristic at most 5. Like non-classical Enriques surfaces they fall into two classes: the singular and the supersingular ones. We give a complete classification in characteristic 5 and compute their Hodge-, Hodge--Witt- and crystalline cohomology (including torsion). Finally, we give an example of a supersingular Godeaux surface in characteristic 5.

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