The L-series of a cubic fourfold

Details The L-series of a cubic fourfold The L-series of a cubic fourfold

2006-01-10

arxiv.org/abs/math/0601207v2

Mathematics

Algebraic Geometry

Modified some proofs

Scientific paper

We study the L-series of cubic fourfolds. Our main result is that, if X/C is a special cubic fourfold associated to some polarized K3 surface $S$, defined over a number field K such that S^[2](K) is not empty, then X has a model over K such that the L-series of the primitive cohomology of X/K can be expressed in the L-series of S/K. This allows us to compute the L-series for a discrete dense subset of cubic fourfolds in the moduli spaces of certain special cubic fourfolds. We also discuss a concrete example.

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