Semi-annihilating dark matter coupled with Majorons
Takumi Miyagi, Takashi Toma

TL;DR
This paper proposes a semi-annihilating dark matter model involving Majorons that can form halo cores and produce detectable neutrino signatures, offering an alternative to traditional weakly interacting massive particles.
Contribution
It introduces a novel semi-annihilating dark matter model with Majorons, demonstrating its effects on halo structure and potential neutrino signals.
Findings
Semi-annihilation induces dark matter halo core formation.
Model predicts a distinctive neutrino spectrum from Majoron decay.
Parameter space allows detection prospects at Hyper-Kamiokande.
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 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…
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