Cosmological Constraints on Neutrino Injection
Toru Kanzaki, Masahiro Kawasaki, Kazunori Kohri, Takeo Moroi
TL;DR
This paper establishes cosmological limits on long-lived particles decaying into neutrinos, using data from big-bang nucleosynthesis, CMB, and diffuse fluxes, relevant for models beyond the standard model.
Contribution
It provides a general framework for constraining relic abundances of neutrino-decaying particles across various cosmological observations.
Findings
Constraints depend on particle lifetime and decay channels.
Limits are derived from multiple cosmological and astrophysical data.
Applicable to a wide range of beyond-standard-model theories.
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.
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