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arXiv · 2603.05200

TeV-scale unification of light dark matter and neutrino mass

Cheng-Wei Chiang·Shu-Yu Ho·Van Que Tran
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Abstract

We demonstrate that TeV-scale heavy neutral leptons (HNLs) responsible for inverse-seesaw neutrino mass generation can simultaneously fix the cosmological abundance and decay properties of dark matter (DM). The spontaneous breaking of lepton number gives rise to a pseudo-Nambu-Goldstone boson that serves as a light DM candidate, whose mass originates from a small explicit symmetry-breaking term. The same HNLs that generate neutrino masses produce the DM via freeze-in and mediate its decay into neutrinos, leading to a tight correlation among neutrino masses, DM relic abundance, and DM lifetime. For collider-accessible TeV-scale HNLs, the observed relic density and lifetime constraints point to sub-GeV DM, yielding observable neutrino signals at JUNO and next-generation detectors such as Hyper-Kamiokande and DUNE. This framework establishes a predictive and experimentally testable link between neutrino mass generation and DM.

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Cheng-Wei Chiang, Shu-Yu Ho, Van Que Tran. 2026-03-05. TeV-scale unification of light dark matter and neutrino mass. https://arxiv.org/abs/2603.05200

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