Genus two curves with quaternionic multiplication and modular jacobian
Abstract
We describe a method to determine all the isomorphism classes of principal polarizations of the modular abelian surfaces Af with quaternionic multiplication attached to a normalized newform f without complex multiplication. We include an example of Af with quaternionic multiplication for which we find numerically a curve C whose Jacobian is Af up to numerical approximation, and we prove that it has quaternionic multiplication and is isogenous to Af.
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