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    Algebraic Geometry in the Daylight

    29–31 Aug 2026
    University of Stavanger, Norway
    Europe/Oslo timezone

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    Enriques surface fibrations and the integral Hodge conjecture

    30 Aug 2026, 09:30
    50m
    Aug 29, 30: Kjølv Egelands hus KE A-205; Aug 31 Kjell Arholmshus  KA U-138 (University of Stavanger, Norway)

    Aug 29, 30: Kjølv Egelands hus KE A-205; Aug 31 Kjell Arholmshus  KA U-138

    University of Stavanger, Norway

    Both buildings you find on Ullandhaug Campus: Kjølv Egelands hus: Kristine Bonnevies vei 22 Mazemap link to KE A-205: https://link.mazemap.com/z2Fi5K7e Kjell Arholms hus: Telegrafdirektør Heftyes vei 73 Mazemap link to KA U-138: https://link.mazemap.com/2qyyrqC4 Lunch will be served at our new SIS building, next to Kjølv Egelands hus.

    Speaker

    Prof. John Christian Ottem

    Description

    I will explain a geometric construction of an Enriques surface fibration over $\mathbb{P}^1$ of even index. This answers a question of Colliot-Thélène and Voisin, and provides new counterexamples to the Integral Hodge conjecture. This is joint work with Fumiaki Suzuki.

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