Modular flavor symmetry and vector-valued modular forms

Abstract

We revisit the modular flavor symmetry from a more general perspective. The scalar modular forms of principal congruence subgroups are extended to the vector-valued modular forms, then we have more possible finite modular groups including ${\Gamma }_N$ and ${\Gamma }_N^{\prime }$ as the flavor symmetry. The theory of vector-valued modular forms provide a method of differential equation to construct the modular multiplets, and it also reveals the simple structure of the modular invariant mass models. We review the theory of vector-valued modular forms and give general results for the lower dimensional vector-valued modular forms. The general finite modular groups are listed up to order 72. We apply the formalism to construct two new lepton mass models based on the finite modular groups $A_4\times Z_2$ and $GL(2,3)$.

arXiv comment37 pages

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• Neutrino Oscillations in the Three Flavor Paradigm
• L-Series for Vector-Valued Weakly Holomorphic Modular Forms and Converse Theorems
• Results on the Non-Vanishing of Derivatives of L-Functions of Vector-Valued Modular Forms