We study the maps induced on cohomology by a Nikulin (i.e. a symplectic) involution on a K3 surface. We parametrize the 11-dimensional irreducible components of the moduli space of algebraic K3 surfaces with a Nikulin involution and we give examples of the general K3 surface in various components. We conclude with some remarks on Morrison-Nikulin involutions, these are Nikulin involutions which interchange two copies of E (8)(-1) in the Neron Severi group.
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Univ Padua, Dipartimento Matemat Tullio Levi Civita, Via Trieste 63, I-35121 Padua, ItalyUniv Padua, Dipartimento Matemat Tullio Levi Civita, Via Trieste 63, I-35121 Padua, Italy
Festi, Dino
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Nijgh, Wim
Platt, Daniel
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Kings Coll London, Dept Math, London WC2R 2LS, EnglandUniv Padua, Dipartimento Matemat Tullio Levi Civita, Via Trieste 63, I-35121 Padua, Italy
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Ritsumeikan University,Department of Mathematical Sciences, College of Science and EngineeringRitsumeikan University,Department of Mathematical Sciences, College of Science and Engineering