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An O-acyclic variety of even index

Algebraic Geometry Seminar

An O-acyclic variety of even index

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Fumiaki Suzuki, University of California, Los Angeles

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笔补蝉蝉肠辞诲别听谤别辩耻颈谤别诲

I will construct a family of Enriques surfaces parametrized by P^1 such that any multi-section has even degree over the base P^1. This gives the first example of an O-acyclic variety over the function field of a complex curve, whose index is not equal to one, and an affirmative answer to a question of Colliot-Thelene and Voisin. I will also discuss applications to related problems, including the integral Hodge conjecture and Murre鈥檚 question on universality of the Abel-Jacobi maps.

This is joint work with John Christian Ottem.

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