Implications of two-component dark matter induced by forbidden channels and thermal freeze-out
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In this article, a model of two-component dark matter based on a hidden U(1)D symmetry is considered, in which the relic densities of the dark matter are determined by forbidden channels and thermal freeze-out.Abstract:
We consider a model of two-component dark matter based on a hidden U(1)D symmetry, in which relic densities of the dark matter are determined by forbidden channels and thermal freeze-out. The hidden U(1)D symmetry is spontaneously broken to a residual 4 symmetry, and the lightest 4 charged particle can be a dark matter candidate. Moreover, depending on the mass hierarchy in the dark sector, we have two-component dark matter. We show that the relic density of the lighter dark matter component can be determined by forbidden annihilation channels which require larger couplings compared to the normal freeze-out mechanism. As a result, a large self-interaction of the lighter dark matter component can be induced, which may solve small scale problems of ΛCDM model. On the other hand, the heavier dark matter component is produced by normal freeze-out mechanism. We find that interesting implications emerge between the two dark matter components in this framework. We explore detectabilities of these dark matter particles and show some parameter space can be tested by the SHiP experiment.read more
Citations
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Boosted self-interacting dark matter in a multi-component dark matter model
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References
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TL;DR: The very accurate data show that the positron fraction is steadily increasing from 10 to ∼ 250 GeV, but, from 20 to 250 GeV, the slope decreases by an order of magnitude, showing the existence of new physical phenomena.
Journal ArticleDOI
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TL;DR: It is demonstrated that the SHiP experiment has a unique potential to discover new physics and can directly probe a number of solutions of beyond the standard model puzzles, such as neutrino masses, baryon asymmetry of the Universe, dark matter, and inflation.
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