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K3 surfaces with involution, equivariant analytic torsion, and automorphic forms on the moduli space IV: The structure of the invariant

Published online by Cambridge University Press:  19 November 2020

Shouhei Ma
Affiliation:
Department of Mathematics, Tokyo Institute of Technology, Tokyo152-8551, Japanma@math.titech.ac.jp
Ken-Ichi Yoshikawa
Affiliation:
Faculty of Science, Department of Mathematics, Kyoto University, Kyoto606-8502, Japanyosikawa@math.kyoto-u.ac.jp

Abstract

Yoshikawa in [Invent. Math. 156 (2004), 53–117] introduces a holomorphic torsion invariant of $K3$ surfaces with involution. In this paper we completely determine its structure as an automorphic function on the moduli space of such $K3$ surfaces. On every component of the moduli space, it is expressed as the product of an explicit Borcherds lift and a classical Siegel modular form. We also introduce its twisted version. We prove its modularity and a certain uniqueness of the modular form corresponding to the twisted holomorphic torsion invariant. This is used to study an equivariant analogue of Borcherds’ conjecture.

Type
Research Article
Copyright
© The Author(s) 2020

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