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Variétés rationnelles

Horaires : Le vendredi 24 février 2017, 15h - 16h

Lieu : ENS, salle W

Brauer groups and the Brauer-Manin sets of Kummer varieties.

Alexei Skorobogatov (Imperial College, Londres)

This is a joint work with Yuri Zarhin. We study Kummer varieties attached to 2-coverings of abelian varieties of arbitrary dimension. Over a number field we show that the subgroup of odd order elements of the Brauer group does not obstruct the Hasse principle. Sufficient conditions for the triviality of the Brauer group can be given, which allow us to give an example of a Kummer K3 surface of geometric Picard rank 17 over the rationals with trivial Brauer group. We establish the non-emptyness of the Brauer-Manin set of everywhere locally soluble Kummer varieties attached to 2-coverings of products of hyperelliptic Jacobians with large Galois action on 2-torsion.


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