Dark matter decay, reionization and microwave background anisotropies

Details Dark matter decay, reionization and microwave background anisotropies Dark matter decay, reionization and microwave background anisotropies

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250..295s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 2, Oct. 1991, p. 295-301. Research supported by Carnegie Trust and MU

Astronomy and Astrophysics

Astrophysics

36

Big Bang Cosmology, Dark Matter, Elementary Particles, Gas Ionization, Radioactive Decay, Relic Radiation, Anisotropy, Galactic Evolution, Intergalactic Media, Optical Thickness, Red Shift

Scientific paper

The implications of the hypothesis that the pregalactic medium may have been ionized by UV photons resulting from the decay of 'dark matter' particles are explored. In a specific model involving decaying neutrinos, it is found that, after recombination at z approximately equal to 1000, the fractional ionization gradually increases with time until the medium becomes fully ionized at z(i) approximately equal to 25, for Omega(b) approximately equal to 0.1. The optical depth back to z approximately equal to z(i) is less than unity; beyond z(i) it increases only as about (1+z) exp 1/4, so that the 'last scattering surface' is at z* approximately equal to 4000. The implications for galaxy formation of this unusual thermal history are described. The predicted small-angular-scale microwave background anisotropies are below current upper limits, provided that the amplitude of the initial fluctuations is adjusted to match the presently observed clustering.

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