1998/11/23 by R. N. Mohapatra, Mohapatra, R. N., D. W. Sciama +1
Physics and Astronomy · #Astrophysics (astro-ph) #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Radio Astronomy Observations and Technology #astro-ph #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9811446
Latex 11 pages; UMD-PP-99-053
openalex publication_date 1998/11/23 · arxiv created 1998/11/30 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We propose the radiative decay of sterile neutrinos which fill a fraction of the halo dark matter with a mass of 27.4 eV and lifetime of ∼ 1022 sec. as a way to explain the observed diffuse ionization in the Milky Way galaxy. Since the sterile neutrino number density in the present universe can be adjusted by arranging its dynamics appropriately, the resulting hot dark matter contribution to Ωm can be small as required by many scenarios of structure formation. On the other hand a 27.4 eV neutrino could easily be the partial halo dark matter. One realization of this idea could be in the context of a mirror universe theory where the gauge and matter content of the standard model are completely duplicated in the mirror sector (except for an asymmetry in the weak scale); the three mirror neutrinos can mix with the known neutrinos via some strongly suppressed mechanism such as the gravitational or heavy right handed neutrino mediated forces. Two of the mirror neutrinos (say ν'μ and ν'τ) could play the role of the above sterile neutrino.