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DTSTART;TZID=Europe/Paris:20191203T113000
DTEND;TZID=Europe/Paris:20191203T123000
DTSTAMP:20191206T085458Z
CREATED:20191130T170723Z
LAST-MODIFIED:20191206T085458Z
UID:7002-1575372600-1575376200@lmv.math.cnrs.fr
SUMMARY:AG : Exposé de Johannes Schmitt (ETH\, Zürich) : Moduli spaces of twisted k-differentials and Pixton's cycle
DESCRIPTION:Johannes Schmitt (ETH – Zürich) \nInside the moduli space of smooth genus g curves with n markings\, there are the loci of curves admitting a meromorphic k-differential with prescribed zeros and poles at the marked points. We explain a compactification of these loci proposed by Farkas-Pandharipande and describe its components and their dimensions. We present a conjectural relation between a weighted fundamental class of the compactification with a tautological cycle defined by Pixton. In recent joint work with David Holmes\, we explain how the weights of the weighted fundamental class arise from intersection multiplicities inside a universal Jacobian.
URL:https://lmv.math.cnrs.fr/evenenement/expose-de-johannes-schmitt/
LOCATION:Bâtiment Fermat\, salle 2105
CATEGORIES:Séminaire AG
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DTSTART;TZID=Europe/Paris:20191210T113000
DTEND;TZID=Europe/Paris:20191210T123000
DTSTAMP:20191213T083640Z
CREATED:20191129T093503Z
LAST-MODIFIED:20191213T083640Z
UID:6992-1575977400-1575981000@lmv.math.cnrs.fr
SUMMARY:AG : Serge Cantat  (CNRS - Univ. Rennes 1) : ANNULÉ
DESCRIPTION:Les twists d’Halphen sont certaines transformations birationnelles de surfaces qui préservent un pinceau de courbes de genre 1. Ils sont un peu analogues aux twists de Dehn sur les surfaces réelles et occupent une place particulière au sein du groupe de Cremona.\nJ’expliquerai quelques uns des résultats récents concernant ces transformations birationnelles\,leurs classes de conjugaison\, les sous-groupes distingués qu’ils engendrent\, etc.
URL:https://lmv.math.cnrs.fr/evenenement/serge-cantat-cnrs-univ-rennes-1/
LOCATION:Bâtiment Fermat\, salle 2105
CATEGORIES:Séminaire AG
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