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Keum–Naie–Mendes Lopes–Pardini surfaces yield an irreducible component of the moduli space

Keum–Naie–Mendes Lopes–Pardini surfaces yield an irreducible component of the moduli space We construct a family of minimal smooth surfaces of general type with K2 = 3 and pg = 0, which are finite (ℤ/2ℤ)2‐covers of the 4‐nodal cubic surface. This turns out to be a five‐dimensional subfamily of the six‐dimensional family constructed by Mendes Lopes and Pardini, which realizes the Keum–Naie surfaces with K2 = 3 as degenerations. We show that the base of the Kuranishi family of a general surface in our subfamily is smooth. We prove that the closure of the corresponding subset of the Keum–Naie–Mendes Lopes–Pardini surfaces is an irreducible component of the Gieseker moduli space. As an important byproduct, it is shown that, for the surfaces in this irreducible component, the degree of the bicanonical map can only be 2 or 4. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Bulletin of the London Mathematical Society Wiley

Keum–Naie–Mendes Lopes–Pardini surfaces yield an irreducible component of the moduli space

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References (16)

Publisher
Wiley
Copyright
© London Mathematical Society
ISSN
0024-6093
eISSN
1469-2120
DOI
10.1112/blms/bdt021
Publisher site
See Article on Publisher Site

Abstract

We construct a family of minimal smooth surfaces of general type with K2 = 3 and pg = 0, which are finite (ℤ/2ℤ)2‐covers of the 4‐nodal cubic surface. This turns out to be a five‐dimensional subfamily of the six‐dimensional family constructed by Mendes Lopes and Pardini, which realizes the Keum–Naie surfaces with K2 = 3 as degenerations. We show that the base of the Kuranishi family of a general surface in our subfamily is smooth. We prove that the closure of the corresponding subset of the Keum–Naie–Mendes Lopes–Pardini surfaces is an irreducible component of the Gieseker moduli space. As an important byproduct, it is shown that, for the surfaces in this irreducible component, the degree of the bicanonical map can only be 2 or 4.

Journal

Bulletin of the London Mathematical SocietyWiley

Published: Oct 1, 2013

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