Sub-GeV dark matter as Pseudo-Nambu-Goldstone bosons from the seesaw scale

Michele Frigerio, Thomas Hambye, Eduard Masso

Research output: Contribution to journalArticleResearchpeer-review

48 Citations (Scopus)


Pseudo-Nambu-Goldstone bosons (pNGBs) are naturally light, spin-zero particles that can be interesting dark-matter (DM) candidates. We study the phenomenology of a pNGBΘ associated with an approximate symmetry of the neutrino seesaw sector. A small coupling of Θ to the Higgs boson is induced radiatively by the neutrino Yukawa couplings. By virtue of this Higgs-portal interaction, (i) the pNGB acquires a mass m Θ proportional to the electroweak scale, and (ii) the observed DM relic density can be generated by the freeze-in of Θ particles with mass m Θ ~ 3 MeV. Alternatively, the coupling of Θ to heavy sterile neutrinos can account for the DM relic density, in the window 1 keV ≤ m Θ ≤ 3 MeV. The decays of Θ into light fermions are suppressed by the seesaw scale, making such pNGBs sufficiently stable to play the role of DM.
Original languageEnglish
Article number021026
JournalPhysical Review X
Issue number2
Publication statusPublished - 1 Dec 2011


  • Particles and fields

Fingerprint Dive into the research topics of 'Sub-GeV dark matter as Pseudo-Nambu-Goldstone bosons from the seesaw scale'. Together they form a unique fingerprint.

Cite this