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Cosmological constraints on the decay of heavy relics into neutrinos
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A massive particle decaying into neutrinos in the early Universe is known to be less constrained than if it was decaying into other standard model particles. However, even if the decay proceeds into neutrinos, the latter still inevitably emit secondary particles undergoing electromagnetic interactions that can be probed. We analyse in details how sensitive various cosmological probes are to such secondary particles, namely CMB anisotropies, CMB spectral distortions, and Big Bang Nucleosynthesis. For relics whose lifetime is shorter than the age of the Universe, this leads to original and stringent bounds on the particle's lifetime as a function of its abundance and mass.
Forward citations
Cited by 6 Pith papers
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Photo- and Hadrodisintegration constraints on massive relics decaying into neutrinos
Decays of heavy relic particles into neutrinos are far more constrained by Big Bang nucleosynthesis than previously thought, once neutrino-neutrino scattering and hadrodisintegration are included.
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Earth rotation turns event timing into a geometric probe of UHE neutrino origin
Earth-rotation timing lowers the number of future KM3NeT events needed to exclude a dark-matter origin of KM3-230213A from ~22–27 to ~14–16.
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Cosmological constraints on TeV-scale dark matter subcomponents decaying between recombination and reionisation
Future global 21-cm observations could beat CMB limits on TeV-scale decaying dark matter for lifetimes ≳10^15 s, especially for decays into neutrinos.
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Coscattering Dark Matter in the Inverse Scotogenic Models
In the inverse scotogenic model, nearly degenerate Z2-odd scalars φ1 and φ2 produce the observed dark matter relic density via coscattering through either the Higgs portal or Yukawa portal, with long-lived φ2 decays g...
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Breaking Dark: Hunting Heavy Decaying Dark Matter with Tibet AS$_\gamma$ and LHAASO-KM2A
Tibet ASγ and LHAASO-KM2A diffuse gamma-ray data exclude decaying dark matter lifetimes below about 10^28 seconds for masses around 10^6-10^9 GeV, for many Standard Model final states.
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Reviving $Z^\prime$ Portal Dark Matter with Conversion Mechanism
In a U(1)_{B-L} Z' portal model with two nearly degenerate dark fermions, the conversion mechanism can produce the observed dark matter relic density while evading current collider and direct-detection constraints.
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