Two A5 modular symmetries for Golden Ratio 2 mixing

Abstract

We present a model of leptonic mixing based on two $A_5$ modular symmetries using the Weinberg operator. The two modular symmetries are broken to the respective diagonal $A_5$ subgroup. At the effective level, the model behaves as a model with a single $A_5$ modular flavour symmetry, but with two moduli. Using both as stabilisers, different residual symmetries are preserved, leading to golden ratio mixing that is perturbed by a rotation.

Comments: 20 pages, 2 figures. arXiv admin note: substantial text overlap with arXiv:2107.04042