Cosmological Constraints on Neutrino Injection

Abstract

We derive general constraints on the relic abundances of a long-lived particle which mainly decays into a neutrino (and something else) at cosmological time scales. Such an exotic particle may show up in various particle-physics models based on physics beyond the standard model. The constraints are obtained from big-bang nucleosynthesis, cosmic microwave background and diffuse neutrino and photon fluxes, depending on the lifetime and the electromagnetic and hadronic branching ratios.

33 pages, 23 figures

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• Detecting non-relativistic cosmic neutrinos by capture on tritium: phenomenology and physics potential
• BBN for the LHC: constraints on lifetimes of the Higgs portal scalars
• Flavored Dark Matter in Direct Detection Experiments and at LHC
• A 331 WIMPy Dark Radiation Model
• Solving the cosmic lithium problems with primordial late-decaying particles
• The New Look pMSSM with Neutralino and Gravitino LSPs
• Cosmic Strings from Supersymmetric Flat Directions
• Compressing the Inert Doublet Model
• Sneutrino NLSP Scenarios in the NUHM with Gravitino Dark Matter
• Universal Extra Dimensions on Real Projective Plane
• Dark Matter from Late Invisible Decays to/of Gravitinos
• Isocurvature perturbations in extra radiation
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• On low-energy predictions of unification models inspired by F-theory
• Reheating Temperature and Gauge Mediation Models of Supersymmetry Breaking
• Right-handed sneutrino dark matter and big-bang nucleosynthesis
• Primordial neutrinos and new physics: novel approach to solving neutrino Boltzmann equation
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• Relaxing Limits from Big Bang Nucleosynthesis on Heavy Neutral Leptons with Axion-like Particles
• Multi-Component Dark Matter from Minimal Flavor Violation
• $\Delta N_{\text{eff}}$ and entropy production from early-decaying gravitinos
• Considerations on supersymmetric Dark Matter beyond the MSSM
• Cosmology of Gravitino LSP Scenario with Right-Handed Sneutrino NLSP
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• Primordial high energy neutrinos: theoretical/observational constraints and sharp spectral features