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Equations of hyperelliptic Shimura curves

Part of: Discontinuous groups and automorphic forms Arithmetic algebraic geometry

Published online by Cambridge University Press:  19 January 2017

Jia-Wei Guo  and
Yifan Yang
Jia-Wei Guo
Affiliation:
Institute of Mathematics, Academia Sinica, Taipei, Taiwan 300 email jiaweiguo312@gmail.com
Yifan Yang
Affiliation:
Department of Applied Mathematics, National Chiao Tung University, Hsinchu, Taiwan 300 National Center for Theoretical Sciences, Taipei, Taiwan 106 email yfyang@math.nctu.edu.tw
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Abstract

By constructing suitable Borcherds forms on Shimura curves and using Schofer’s formula for norms of values of Borcherds forms at CM points, we determine all of the equations of hyperelliptic Shimura curves $X_{0}^{D}(N)$ . As a byproduct, we also address the problem of whether a modular form on Shimura curves $X_{0}^{D}(N)/W_{D,N}$ with a divisor supported on CM divisors can be realized as a Borcherds form, where $X_{0}^{D}(N)/W_{D,N}$ denotes the quotient of $X_{0}^{D}(N)$ by all of the Atkin–Lehner involutions. The construction of Borcherds forms is done by solving certain integer programming problems.

Keywords

Borcherds formsShimura curves

MSC classification

Primary: 11F03: Modular and automorphic functions
Secondary: 11G15: Complex multiplication and moduli of abelian varieties 11G18: Arithmetic aspects of modular and Shimura varieties

Information

Type
Research Article
Information
Compositio Mathematica , Volume 153 , Issue 1 , January 2017 , pp. 1 - 40
Copyright
© The Authors 2017 

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