Abstract
We construct a new 20-dimensional family of projective hyper-Kähler fourfolds and prove that they are deformation-equivalent to the second punctual Hilbert scheme of a K3 surface of genus 12.

Managing Editor: Weissauer, Rainer
Ed. by Colding, Tobias / Cuntz, Joachim / Huybrechts, Daniel / Hwang, Jun-Muk
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1École Normale Supérieure, Département de Mathématiques et Applications, CNRS UMR 8553, 45 rue d'Ulm, 75230 Paris cedex 05, France. e-mail: odebarre@dma.ens.fr
2IHÉS and Institut de Mathématiques de Jussieu, 175 rue du Chevaleret, 75013 Paris, France. e-mail: voisin@math.jussieu.fr
Citation Information: Journal für die reine und angewandte Mathematik (Crelles Journal). Volume 2010, Issue 649, Pages 63–87, ISSN (Online) 1435-5345, ISSN (Print) 0075-4102, DOI: 10.1515/crelle.2010.089, October 2010
We construct a new 20-dimensional family of projective hyper-Kähler fourfolds and prove that they are deformation-equivalent to the second punctual Hilbert scheme of a K3 surface of genus 12.
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