A linear system on Naruki's moduli space of marked cubic surfaces

Details A linear system on Naruki's moduli space of marked cubic surfaces A linear system on Naruki's moduli space of marked cubic surfaces

2001-01-19

arxiv.org/abs/math/0101161v1

Mathematics

Algebraic Geometry

23 pages

Scientific paper

Allcock and Freitag recently showed that the moduli space of marked cubic surfaces is a subvariety of a nine dimensional projective space which is defined by cubic equations. They used the theory of automorphic forms on ball quotients to obtain these results. Here we describe the same embedding using Naruki's toric model of the moduli space. We also give an explicit parametrization of the tritangent divisors, we discuss another way to find equations for the image and we show that the moduli space maps, with degree at least ten, onto the unique quintic hypersurface in a five dimensional projective space which is invariant under the action of the Weyl group of the root system E_6.

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