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X-WR-CALDESC:évènements pour Département de mathématiques et applications
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TZID:Europe/Paris
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TZOFFSETFROM:+0100
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TZNAME:CEST
DTSTART:20170326T010000
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DTSTART:20171029T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20170224T150000
DTEND;TZID=Europe/Paris:20170224T160000
DTSTAMP:20260412T025027
CREATED:20170224T140000Z
LAST-MODIFIED:20211104T103801Z
UID:8365-1487948400-1487952000@www.math.ens.psl.eu
SUMMARY:Brauer groups and the Brauer-Manin sets of Kummer varieties.
DESCRIPTION: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.
URL:https://www.math.ens.psl.eu/evenement/brauer-groups-and-the-brauer-manin-sets-of-kummer-varieties/
LOCATION:ENS Salle W
CATEGORIES:Variétés rationnelles
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20170224T163000
DTEND;TZID=Europe/Paris:20170224T173000
DTSTAMP:20260412T025027
CREATED:20170224T153000Z
LAST-MODIFIED:20211104T103802Z
UID:8366-1487953800-1487957400@www.math.ens.psl.eu
SUMMARY:Actions de p-groupes sur les variétés projectives.
DESCRIPTION:Je discuterai des contraintes que la géométrie d’une variété projective fait peser sur les possibles actions de p-groupes sur cette dernière. J’expliquerai en particulier comment le calcul d’invariants numériques\, tels que les nombres caractéristiques\, peut permettre de prévoir l’existence de points fixes.
URL:https://www.math.ens.psl.eu/evenement/actions-de-p-groupes-sur-les-varietes-projectives/
LOCATION:ENS Salle W
CATEGORIES:Variétés rationnelles
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