Neutrino mass and leptogenesis in the non-SUSY modular $A_5^{\prime }$ inverse seesaw model

Abstract

A non-supersymmetric inverse seesaw model of neutrino mass based on the $A_5^{\prime }$ modular symmetry is presented. This framework provides a combined explanation for neutrino masses, mixing, and the cosmic baryon asymmetry through leptogenesis. Three concrete realizations are constructed, and their phenomenological predictions are analyzed. The results are not only compatible with the measured neutrino oscillation parameters within the current experimental 3$\sigma$ ranges, but also provide predictions for the neutrino mass ordering, Dirac and Majorana CP-violating phases, and the effective Majorana mass in neutrinoless double beta decay. The model further realizes TeV-scale leptogenesis consistent with the observed baryon asymmetry, rendering the scenario testable in both low-energy neutrino experiments and high-energy collider searches.

Comments: 45 pages, 14 figures, 5 tables, references added, some discussions extended in greater detail, matches the published version