Periods of an arrangement of six lines and Campedelli surfaces

Details Periods of an arrangement of six lines and Campedelli surfaces Periods of an arrangement of six lines and Campedelli surfaces

2011-06-23

arxiv.org/abs/1106.4846v1

Mathematics

Algebraic Geometry

48 pages, 1 figure, part of the author's PhD thesis

Scientific paper

We define a period map for classical Campedelli surfaces, using a covering trick as in the case of Enriques surfaces: the period map is shown to come from a family of Enriques surfaces, obtained as quotients of the Campedelli surface by an involution. The period map realises an isomorphism between a projective variety obtained by invariant theory, and the Baily-Borel compactification of an arithmetic quotient, in the same fashion as in the work of Matsumoto, Sasaki and Yoshida. The result is proved from scratch using traditional methods. As another consequence we determine properties of the monodromy of Campedelli surfaces with a choice of double cover.

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