Re-ionization and decaying dark matter

Details Re-ionization and decaying dark matter Re-ionization and decaying dark matter

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991stin...9211944d&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Dark Matter, Intergalactic Media, Ionization, Radioactive Decay, Recombination Reactions, Universe, Astronomical Models, Boltzmann Transport Equation, Cosmology, Neutrinos, Photons, Spectra

Scientific paper

Gunn-Peterson tests suggest that the Universe was reionized after the standard recombination epoch. A systematic treatment is presented of the ionization process by deriving the Boltzmann equations appropriate to this regime. A compact solution for the photon spectrum is found in terms of the ionization ratio. These equations are then solved numerically for the Decaying Dark Matter scenario, wherein neutrinos with mass of order 30 eV radiatively decay producing photons which ionize the intergalactic medium. It was found that the neutrino mass and lifetime are severely constrained by Gunn-Peterson tests, observations of the diffuse photon spectrum in the ultraviolet regime, and the Hubble parameter.

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