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NON-SYMPLECTIC INVOLUTIONS ON MANIFOLDS OF $K3^{[n]}$-TYPE

Published online by Cambridge University Press:  27 February 2020

CHIARA CAMERE
Affiliation:
Dipartimento di Matematica “F. Enriques”, Università degli Studi di Milano, Via Cesare Saldini 50, 20133Milano, Italy email chiara.camere@unimi.it
ALBERTO CATTANEO
Affiliation:
Mathematisches Institut and Hausdorff Center for Mathematics, Universität Bonn, Endenicher Allee 60, 53115Bonn, Germany email cattaneo@math.uni-bonn.de
ANDREA CATTANEO
Affiliation:
Dipartimento di Matematica e Informatica “U. Dini”, Università degli Studi di Firenze, Viale Morgagni, 67/a, 50134Firenze, Italy email cattaneo@math.univ-lyon1.fr, andrea.cattaneo@unifi.it

Abstract

We study irreducible holomorphic symplectic manifolds deformation equivalent to Hilbert schemes of points on a $K3$ surface and admitting a non-symplectic involution. We classify the possible discriminant quadratic forms of the invariant and coinvariant lattice for the action of the involution on cohomology and explicitly describe the lattices in the cases where the invariant lattice has small rank. We also give a modular description of all $d$-dimensional families of manifolds of $K3^{[n]}$-type with a non-symplectic involution for $d\geqslant 19$ and $n\leqslant 5$ and provide examples arising as moduli spaces of twisted sheaves on a $K3$ surface.

Type
Article
Copyright
© 2020 Foundation Nagoya Mathematical Journal

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