2006/07/07 by Eung Jin Chun, Hang Bae Kim · 1 citation
Physics and Astronomy · #Astrophysics #Axion #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Dark matter #Light dark matter #Neutralino #Neutrino #Particle physics #Particle physics theoretical and experimental studies #Physics #R-parity #Scalar field dark matter #Supersymmetry #astro-ph #hep-ph
paper · pdf · doi:10.1088/1126-6708/2006/10/082
published as JHEP0610:082,2006 · 10 pages
arxiv created 2006/07/07 · openalex publication_date 2006/10/30 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Motivated by the recent observation of the 511 keV γ-ray line emissions from the galactic bulge and an explanation for it by the decays of light dark matter particles, we consider the light axino whose mass can be in the 1-10 MeV range, particularly, in the context of gauge-mediated supersymmetry breaking models. We discuss the production processes and cosmological constraints for the light axino dark matter. It is shown that the bilinear R-parity violating terms provide an appropriate mixing between the axino and neutrinos so that the light axino decays dominantly to e+ e- ν. We point out that the same bilinear R-parity violations consistently give both the lifetime of the axino required to explain the observed 511 keV γ-rays and the observed neutrino masses and mixing.