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On the Chow groups of certain EPW sextics

Research paper by Robert Laterveer

Indexed on: 28 Aug '18Published on: 28 Aug '18Published in: arXiv - Mathematics - Algebraic Geometry



Abstract

This note is about the Hilbert square $X=S^{[2]}$, where $S$ is a general $K3$ surface of degree $10$, and the anti-symplectic birational involution $\iota$ of $X$ constructed by O'Grady. The main result is that the action of $\iota$ on certain pieces of the Chow groups of $X$ is as expected by Bloch's conjecture. Since $X$ is birational to a double EPW sextic $X^\prime$, this has consequences for the Chow ring of the EPW sextic $Y\subset{\mathbb{P}}^5$ associated to $X^\prime$.