Gravitational waves in an A4 neutrino mass model
- 1University of California
Abstract
The A4 flavor symmetry has provided tremendous insight into the flavor structure of the lepton sector of the Standard Model, predicting a very good approximation to neutrino mixing angles called tri-bimaximal mixing (TBM). A4 is spontaneously broken by a scalar called the flavon, and when this happens a number of degenerate vacua can form, resulting in so-called domain walls. These objects are not observed and hence need to be annihilated. This is usually done by explicitly breaking A4 by adding a bias term to the scalar potential. In this paper, we construct a new model invariant under A4 × ℤ4 which creates cosmologically viable domain walls, lifts the degeneracy of the vacuum giving a natural mechanism for domain walls to annihilate, as well as predicts realistic neutrino mixing angles; all utilizing cross couplings between flavons. The annihilation of the domain walls, with proper choice of wall tension and the consequent bias term, leads to a gravitational wave signal that is potentially detectable in near future gravitational wave experiments, and interestingly intersects with the observed Pulsar Timing Array signal.
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BibTeX
@article{chen2026gravitational,
title = {{Gravitational waves in an A4 neutrino mass model}},
author = {Mu-Chun Chen and Harold J. Matias and Cameron Moffett-Smith},
journal = {Journal of High Energy Physics},
year = {2026},
month = nov,
doi = {10.1007/jhep11(2026)052},
url = {https://link.springer.com/article/10.1007/JHEP11(2026)052},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Gravitational waves in an A4 neutrino mass model
AU - Mu-Chun Chen
AU - Harold J. Matias
AU - Cameron Moffett-Smith
PY - 2026
DA - 2026/11/05
JO - Journal of High Energy Physics
DO - 10.1007/jhep11(2026)052
UR - https://link.springer.com/article/10.1007/JHEP11(2026)052
AB - The A4 flavor symmetry has provided tremendous insight into the flavor structure of the lepton sector of the Standard Model, predicting a very good approximation to neutrino mixing angles called tri-bimaximal mixing (TBM). A4 is spontaneously broken by a scalar called the flavon, and when this happens a number of degenerate vacua can form, resulting in so-called domain walls. These objects are not observed and hence need to be annihilated. This is usually done by explicitly breaking A4 by adding a bias term to the scalar potential. In this paper, we construct a new model invariant under A4 × ℤ4 which creates cosmologically viable domain walls, lifts the degeneracy of the vacuum giving a natural mechanism for domain walls to annihilate, as well as predicts realistic neutrino mixing angles; all utilizing cross couplings between flavons. The annihilation of the domain walls, with proper choice of wall tension and the consequent bias term, leads to a gravitational wave signal that is potentially detectable in near future gravitational wave experiments, and interestingly intersects with the observed Pulsar Timing Array signal.
SN - 1029-8479
ER -