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Origin of Sterile Neutrino Dark Matter via Vector Secret Neutrino Interactions
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abstract
Secret neutrino interactions can play an essential role in the origin of dark matter. We present an anatomy of production mechanisms for sterile neutrino dark matter, a keV-scale gauge-singlet fermion that mixes with active neutrinos, in the presence of a new vector boson mediating secret interactions among active neutrinos. We identify three regimes of the vector boson's mass and coupling where it makes distinct impact on dark matter production through the dispersion relations and/or scattering rates. We also analyze models with gauged $L_\mu-L_\tau$ and $B-L$ numbers which have a similar dark matter cosmology but different vector boson phenomenology. We derive the parameter space in these models where the observed relic abundance is produced for sterile neutrino dark matter. They serve as well-motivated target for the upcoming experimental searches.
Forward citations
Cited by 4 Pith papers
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Opening up New Parameter Space for Sterile Neutrino Dark Matter
A new production channel, nu_a + nu_a -> nu_s + nu_s, mediated by a heavy scalar, can generate the observed sterile neutrino dark matter abundance independently of active-sterile mixing.
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Widen the Resonance at Ultra-High Energies: Novel Probes of Neutrino Self-interactions in the High-Mass Regime
If one neutrino species in the cosmic neutrino background is still relativistic today, UHE neutrinos scattering off it can resonantly disappear over a broad energy range, and GRAND could detect that dip to probe neutr...
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Multiple Populations of Same Sterile Neutrino as Dark Matter
A single sterile neutrino species can be produced by multiple early-universe mechanisms, yielding cold and warm dark matter populations with a two-humped momentum spectrum.
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Constraining self-interacting ultrahigh-energy muon neutrinos by cosmic microwave background spectral distortion
Scalar-mediated scattering of PeV muon neutrinos on the cosmic neutrino background injects photon energy that distorts the CMB, giving coupling bounds g_nu_mu of about 10^-4 to 10^-5 with projected PIXIE sensitivities...
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