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Majorons are (pseudo-)Nambu-Goldstone bosons associated with lepton numbersymmetry breaking due to the Majorana mass term of neutrinos introduced in theseesaw mechanism. They are good dark matter candidates since their lifetime issuppressed by the lepton number breaking scale. We update constraints anddiscuss future prospects on majoron dark matter in the singlet majoron modelsbased on neutrino, gamma-ray, and cosmic-ray telescopes in the mass region ofMeV--10 TeV.

Updated Constraints and Future Prospects on Majoron Dark Matter