X-ray photons from late-decaying majoron dark matter

Abstract

An attractive way to generate neutrino masses as required to account for current neutrino oscillation data involves the spontaneous breaking of lepton number. The resulting majoron may pick up a mass due to gravity. If its mass lies in the kilovolt scale, the majoron can play the role of late-decaying Dark Matter (LDDM), decaying mainly to neutrinos. In general the majoron has also a sub-dominant decay to two photons leading to a mono-energetic emission line which can be used as a test of the LDDM scenario. We compare expected photon emission rates with observations in order to obtain model independent restrictions on the relevant parameters. We also illustrate the resulting sensitivities within an explicit seesaw realisation, where the majoron couples to photons due to the presence of a Higgs triplet.

16 pages, 6 figures. References added. Comments added in Sec. 5. Matches version accepted for publication in JCAP

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Cited by in corpus (8)

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• Bosonic super-WIMPs as keV-scale dark matter
• The Poker Face of the Majoron Dark Matter Model: LUX to keV Line
• Strongest model-independent bound on the lifetime of Dark Matter
• Cold keV dark matter from decays and scatterings
• Minimal supergravity sneutrino dark matter and inverse seesaw neutrino masses
• Supernova Constraints on Massive (Pseudo)Scalar Coupling to Neutrinos
• Monochromatic neutrinos generated by dark matter and the see-saw mechanism