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arXiv · 2301.00570

The Harris-Venkatesh conjecture for derived Hecke operators I: imaginary dihedral forms

Robin Zhang
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Abstract

The Harris-Venkatesh conjecture relates the action of derived Hecke operators on weight-one modular forms to algebraic units. We introduce the Harris-Venkatesh period, defined on a product of modular curves, and show that it specializes to the derived Hecke action on weight-one forms. We also define and construct optimal forms, two-variable modular forms that explicitly realize a theta lifting from the Jacquet-Langlands correspondence. Using a positive-characteristic multiplicity-one argument comparing the Harris-Venkatesh period on newforms and optimal forms, we prove the full Harris-Venkatesh conjecture for imaginary dihedral weight-one modular forms.

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Robin Zhang. 2023-01-02. The Harris-Venkatesh conjecture for derived Hecke operators I: imaginary dihedral forms. https://arxiv.org/abs/2301.00570

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