Dual double EPW-sextics and their periods
Algebraic Geometry
2007-05-23 v1
Abstract
A locally complete family of projective symplectic 4-folds is provided by natural double covers of Eisenbud-Popescu-Walter (EPW) sextic hypersurfaces in projective 5-space. The dual of an EPW sextic is another EPW sextic, thus to a double EPW sextic X we may associate a "dual" double EPW sextic X^{\vee}. We show how to obtain the Hodge structure on H^2(X^{\vee}) from that on H^2(X); it turns out that they are isomorphic over the rationals but not over the integers (in general).
Cite
@article{arxiv.math/0605085,
title = {Dual double EPW-sextics and their periods},
author = {Kieran G. O'Grady},
journal= {arXiv preprint arXiv:math/0605085},
year = {2007}
}
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31 pages