JIRCRM · Moduli spaces of K3 surfaces and integral canonical models of Shimura varieties

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Project objective

In the proposed research we will focus our attention on certain orthogonal Shimura varieties and their relation to K3 surfaces. Over the complex numbers, using periods of K3 surfaces, one can identify the moduli space of polarized K3 surfaces with a certain level K-structure, for a suitable group K, with an open subvariety of Sh(SO(2,19),X)-K.This fact boils down to two very important results in complex algebraic geometry, namely the Torelli theorem for K3 surfaces and Kulikov's degeneration theorem. Further analysis of this immersion shows that it is defined over Q. We want to carry out these ideas in mixed characteristic and prove similar arithmetic results. An integral canonical model of Sh(SO(2,19),X)-K is a scheme over the completion of the ring of integers Z at a prime p, having Sh(SO(2,19),X)/K as the general fiber and satisfying a certain extension property.A way to construct those models is to use moduli schemes of polarized abelian varieties. We want to use this strategy to show the existence o f a period map from the space of polarized K3 surfaces with level K-structure to the integral canonical model of Sh(SO(2,19),X)/K. We propose to study this morphism and show that it is etale and, even stronger, that it is an open immersion. This is a gener alization of the global Torelli theorem for K3 surfaces in mixed characteristic. To do this, we plan to use some recent developments in integral p-adic Hodge theory and p-adic periods, which is an analogue of the complex case in positive characteristic.This result will give a modular interpretation of the integral canonical model of Sh(SO(2,19),X)/K. Carrying out this program would provide us with strong tools for studying the irreducibility of the moduli spaces of polarized K3 surface in mixed characteristic. Such a result, being very important on its own, would also imply the validity of some other open problems in the theory of K3 surfaces such as Artin's conjecture on supersingular K3 surfaces.

Original text from CORDIS.

Participants

• CENTRE DE RECERCA MATEMATICA · BELLATERRACoordinatorCity levelSpain

Links

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