2007/05/09 by Toru Kanzaki, Masahiro Kawasaki, Kazunori Kohri +1 · 1 citation
Physics and Astronomy · #Cosmology and Gravitation Theories #Neutrino Physics Research #Particle physics theoretical and experimental studies #astro-ph #hep-ph
paper · pdf · doi:10.1103/physrevd.76.105017
published as Phys.Rev.D76:105017,2007 · 33 pages, 23 figures
arxiv created 2007/05/09 · openalex publication_date 2007/11/16 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.