Hyperelliptic surfaces with $K^2 < 4χ- 6$

Details Hyperelliptic surfaces with $K^2 < 4χ- 6$ Hyperelliptic surfaces with $K^2 < 4χ- 6$

2011-12-29

arxiv.org/abs/1112.6359v1

Mathematics

Algebraic Geometry

17 pages

Scientific paper

Let $S$ be a smooth minimal surface of general type with a (rational) pencil of hyperelliptic curves of minimal genus $g$. We prove that if $K_S^2<4\chi(\mathcal O_S)-6,$ then $g$ is bounded. The surface $S$ is determined by the branch locus of the covering $S\rightarrow S/i,$ where $i$ is the hyperelliptic involution of $S.$ For $K_S^2<3\chi(\mathcal O_S)-6,$ we show how to determine the possibilities for this branch curve. As an application, given $g>4$ and $K_S^2-3\chi(\mathcal O_S)<-6,$ we compute the maximum value for $\chi(\mathcal O_S).$ This list of possibilities is sharp.

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