DonateSingular Moduli of Shimura Curves
Free Book - "Singular Moduli of Shimura Curves"
by: Eric Errthum
The j-function acts as a parameterization of the classical modular curve. Its values at complex multiplication (CM) points are called singular moduli and are algebraic integers. A Shimura curve is a generalization of the modular curve and, if the Shimura curve has genus 0, a rational parameterizing function evaluated at a CM point is again algebraic over the rational field. This thesis shows that the coordinate maps given by Elkies for the Shimura curves associated to the quaternion algebras with discriminants 6 and 10 are Borcherds lifts of vector-valued modular forms. This property is then used to explicitly compute the rational norms of singular moduli on these curves. This method not only verifies the conjectural values for the rational CM points given by Elkies, but also provides a way of algebraically calculating the norms of CM points with arbitrarily large negative discriminant.
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