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Moduli of non-standard Nikulin surfaces in low genus

Knutsen, Andreas Leopold; Lelli-Chiesa, Margherita; Verra, Alessandro
Journal article, Peer reviewed
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URI
https://hdl.handle.net/11250/2770267
Date
2020
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  • Department of Mathematics [799]
  • Registrations from Cristin [5446]
Original version
Annali della Scuola Normale Superiore di Pisa (Classe Scienze), Serie V. 2020, XXI (issue special), 361-384.   https://doi.org/10.2422/2036-2145.201802_018
Abstract
Primitively polarized genus g Nikulin surfaces (S, M, H) are of two types, that we call standard and non-standard depending on whether the lattice embedding Z[H] ⊕⊥ N ⊂ Pic S is primitive. Here H is the genus g polarization and N is the Nikulin lattice. We concentrate on the non-standard case, which only occurs in odd genus. In particular, we study the birational geometry of the moduli space of nonstandard Nikulin surfaces of genus g and prove its rationality for g = 7, 11 and the existence of a rational double cover of it when g = 9. Furthermore, if (S, M, H) is general in the above moduli space and (C, M|C ) is a general Prym curve in |H|, we determine the dimension of the family of non-standard Nikulin surfaces of genus g containing (C, M|C ) for 3 ≤ g ≤ 11; this completes the study of the Prym-Nikulin map initiated in [KLV].
Publisher
Scuola Normale Superiore
Journal
Annali della Scuola Normale Superiore di Pisa (Classe Scienze), Serie V

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