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Enhancing Dark Matter Annihilation into Neutrinos
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We perform a detailed and quasi model-independent analysis of direct annihilation of Dark Matter into neutrinos. Considering different cases for scalar and fermionic Dark Matter, we identify several settings in which this annihilation is enhanced, contrary to some statements in the literature. They key point is that several restrictions of, e.g., a supersymmetric framework do not hold in general. The mass generation mechanism of the neutrinos plays an important role, too. We illustrate our considerations by two examples that are not (as usually) suppressed by the smallness of the neutrino mass, for which we also present a numerical analysis. Our results can be easily used as guidelines for model building.
Forward citations
Cited by 3 Pith papers
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The Highest-Energy Neutrino Event Constrains Dark Matter-Neutrino Interactions
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Neutrino portals to MeV WIMPs with s-channel mediators
This paper constructs two new neutrino-portal dark matter models with s-channel scalar and pseudoscalar mediators and maps how JUNO, Hyper-Kamiokande and CMB-S4 would probe their parameter space.
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Neutrino Diffusion within Dark Matter Spikes
Neutrinos diffusing through dense dark matter spikes around supermassive black holes can be delayed by days, but the accompanying flux suppression means dark matter alone probably cannot explain the observed 100+ day ...
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