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  • Open Access

Inverse seesaw model in nonholomorphic modular A4 flavor symmetry

Xianshuo Zhang* and Yakefu Reyimuaji†

  • *Contact author: zxianshuo@yeah.net
  • †Contact author: yreyi@hotmail.com
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Phys. Rev. D 112, 075050 – Published 28 October, 2025

DOI: https://doi.org/10.1103/17p3-bw5r

Abstract

This paper investigates an inverse seesaw model of neutrino masses based on nonholomorphic modular A4 symmetry, extending the framework of modular-invariant flavor models beyond the conventional holomorphic paradigm. After the general theoretical framework is established, three concrete model realizations distinguished by their A4 representation assignments and modular weight configurations for the matter fields are analyzed. Focusing on these three specific realizations, a comprehensive analysis of neutrino phenomenology is performed. By constraining the modulus parameter τ to the fundamental domain and systematically scanning the parameter space, regions compatible with current neutrino oscillation data are identified. The numerical results provide predictions for currently unmeasured quantities, including the absolute neutrino mass scale, Dirac CP-violating phase, and Majorana phases. These predictions establish specific, testable signatures for upcoming neutrino experiments, particularly in neutrinoless double beta decay and precision oscillation measurements. The framework offers a well-defined target for future experimental verification or exclusion, while demonstrating the phenomenological viability of nonholomorphic modular symmetry approaches to flavor structure.

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Phys. Rev. D 112, 075050– Published 28 October, 2025
  • Received 25 September 2025
  • Accepted 9 October 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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