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SUMMARY:Enriques surface fibrations with non-algebraic integral Hodge clas
 ses - John Christian Ottem (University of Oslo)
DTSTART:20200203T150000Z
DTEND:20200203T160000Z
UID:TALK138874@talks.cam.ac.uk
CONTACT:INI IT
DESCRIPTION:I will explain a construction of a certain pencil of Enriques 
 surfaces with non-algebraic integral Hodge classes of non-torsion type. Th
 is&nbsp\;gives the first example of a threefold with trivial Chow group of
  zero-cycles on which the integral Hodge conjecture fails. If time permits
 \, I&nbsp\;will explain an application to a classical question of Murre on
  the universality of the Abel-Jacobi maps in codimension three. This is jo
 int&nbsp\;work with Fumiaki Suzuki.&#x200B\;<br><br><br><br><br>
LOCATION:Seminar Room 2\, Newton Institute
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