A_4-based neutrino masses with Majoron decaying dark matter

Abstract

We propose an A_4 flavor-symmetric SU(3)xSU(2)xU(1) seesaw model where lepton number is broken spontaneously. A consistent two-zero texture pattern of neutrino masses and mixing emerges from the interplay of type-I and type-II seesaw contributions, with important phenomenological predictions. We show that, if the Majoron becomes massive, such seesaw scenario provides a viable candidate for decaying dark matter, consistent with cosmic microwave background lifetime constraints that follow from current WMAP observations. We also calculate the sub-leading one-loop-induced decay into photons which leads to a mono-energetic emission line that may be observed in future X-ray missions such as Xenia.

16 pages, 6 eps figures. Minor corrections. To appear in Phys. Rev. D

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• The Dark Side of the Littlest Seesaw: freeze-in, the two right-handed neutrino portal and leptogenesis-friendly fimpzillas
• Signatures of Dark Radiation in Neutrino and Dark Matter Detectors
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• Direct and Indirect Detection of Dark Matter in D6 Flavor Symmetric Model
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