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University of Cambridge > Talks.cam > Isaac Newton Institute Seminar Series > Enriques surface fibrations with non-algebraic integral Hodge classes

## Enriques surface fibrations with non-algebraic integral Hodge classesAdd to your list(s) Download to your calendar using vCal - John Christian Ottem (University of Oslo)
- Monday 03 February 2020, 15:00-16:00
- Seminar Room 2, Newton Institute.
If you have a question about this talk, please contact info@newton.ac.uk. KAH - K-theory, algebraic cycles and motivic homotopy theory I will explain a construction of a certain pencil of Enriques surfaces with non-algebraic integral Hodge classes of non-torsion type. This 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 will explain an application to a classical question of Murre on the universality of the Abel-Jacobi maps in codimension three. This is joint work with Fumiaki Suzuki. This talk is part of the Isaac Newton Institute Seminar Series series. ## This talk is included in these lists:- All CMS events
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