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KODAIRA DIMENSION OF UNIVERSAL HOLOMORPHIC SYMPLECTIC VARIETIES

Part of: Surfaces and higher-dimensional varieties Discontinuous groups and automorphic forms Arithmetic problems. Diophantine geometry

Published online by Cambridge University Press:  02 February 2021

Shouhei Ma Open the ORCID record for Shouhei Ma [Opens in a new window]
Shouhei Ma*
Affiliation:
Department of Mathematics, Tokyo Institute of Technology, Tokyo152-8551, Japan (ma@math.titech.ac.jp)
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Abstract

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We prove that the Kodaira dimension of the n-fold universal family of lattice-polarised holomorphic symplectic varieties with dominant and generically finite period map stabilises to the moduli number when n is sufficiently large. Then we study the transition of Kodaira dimension explicitly, from negative to nonnegative, for known explicit families of polarised symplectic varieties. In particular, we determine the exact transition point in the Beauville–Donagi and Debarre–Voisin cases, where the Borcherds $\Phi _{12}$ form plays a crucial role.

Keywords

holomorphic symplectic varietyuniversal familyKodaira dimensionmodular formBorcherds product

MSC classification

Primary: 14J15: Moduli, classification
Secondary: 11F55: Other groups and their modular and automorphic forms (several variables) 14G35: Modular and Shimura varieties
Type
Research Article
Information
Journal of the Institute of Mathematics of Jussieu , Volume 21 , Issue 6 , November 2022 , pp. 1849 - 1866
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2021. Published by Cambridge University Press

Footnotes

Supported by JSPS KAKENHI 15H05738 and 17K14158

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