Physics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992phrvd..45.1076d&link_type=abstract
Physical Review D (Particles, Fields, Gravitation, and Cosmology), Volume 45, Issue 4, 15 February 1992, pp.1076-1090
Physics
9
Particle-Theory And Field-Theory Models Of The Early Universe, Elementary Particle Processes, Background Radiations
Scientific paper
Gunn-Peterson tests suggest that the Universe was reionized after the standard recombination epoch. We present a systematic treatment 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 a mass of the order of 30 eV radiatively decay producing photons which ionize the intergalactic medium. We find 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.
Dodelson Scott
Jubas Jay M.
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