Semi-annihilating dark matter coupled with Majorons

Abstract

The thermal production mechanism of dark matter is attractive and well-motivated by predictivity. A representative of this type of dark matter candidate is the canonical, weakly interacting massive particles. An alternative is semi-annihilating dark matter, which exhibits different phenomenological aspects from the former example. In this study, we constructed a model of dark matter semi-annihilating into a pair of anti-dark matter and a Majoron based on a global $U(1{)}_{B-L}$ symmetry, and show that semi-annihilation induces the core formation of dark matter halos, which can alleviate the so-called small-scale problems. In addition, the box-shaped spectrum of neutrinos was produced by the subsequent decay of the Majoron. This can be a distinctive signature of the dark matter in the model. We find a parameter space where the produced neutrinos can be detected by the future large-volume neutrino detector Hyper-Kamiokande. We also compared the dark matter scenario with the case of halo core formation by the strongly self-interacting dark matter.

19 pages, 5 figures

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Cited by in corpus (5)

• Simultaneous detection of boosted dark matter and neutrinos from the semi-annihilation at DUNE
• Semi-Annihilation of Fermionic Dark Matter
• Neutrino portals to MeV WIMPs with s-channel mediators
• Axion Portal to Scalar Dark Matter: Unveiling Stabilizing Symmetry Footprints
• Pseudo-Nambu-Goldstone-boson Dark Matter from Three Complex Scalars