https://doi.org/10.1140/epjc/s10052-026-15312-z
Regular Article - Theoretical Physics
Verifiable type-III seesaw and dark matter in a gauged 
symmetric model
1
School of Physical Sciences, Indian Institute of Technology Goa, 403401, Ponda, Goa, India
2
Department of Physics and Institute of Basic Science, Sungkyunkwan University, 16419, Suwon, Korea
3
Department of Physics, Indian Institute of Technology Hyderabad, 502285, Kandi, Telangana, India
4
Nuclear Physics Division, Bhabha Atomic Research Centre, 400085, Mumbai, India
5
Homi Bhabha National Institute, Anushakti Nagar, 400094, Mumbai, India
a
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Received:
14
October
2025
Accepted:
11
January
2026
Published online:
24
January
2026
Abstract
We propose a new extension of the Standard Model that incorporates a gauged 
symmetry and the type-III seesaw mechanism to explain neutrino mass generation and provide a viable dark matter (DM) candidate. Unlike the type-I seesaw, the type-III seesaw extension under is not automatically anomaly-free. We show that these anomalies can be canceled by introducing additional chiral fermions, which naturally emerge as DM candidates in the model. We thoroughly analyze the DM phenomenology, including relic density, direct and indirect detection prospects, and constraints from current experimental data. Furthermore, we explore the collider signatures of the model, highlighting the enhanced production cross-section of the triplet fermions mediated by the 
gauge boson, as well as the potential disappearing track signatures. Additionally, we investigate the gravitational wave signals arising from the first-order phase transition during symmetry breaking, offering a complementary cosmological probe of the framework.
© The Author(s) 2026
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Funded by SCOAP3.
