Physics – Nuclear Physics
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988nuphb.310..669a&link_type=abstract
Nuclear Physics B, Volume 310, Issue 3-4, p. 669-692.
Physics
Nuclear Physics
9
Scientific paper
Recent observational results had lead to a revival of interest in neutrino-dominated universe. However, we recall that current constraints make the neutrino an unlikely candidate for the dark matter. In this paper, we show that a supersymmetric particle with a typical mass of a few tens of eV will be a much better candidate. Such a particle is radiatively unstable, and its lifetime is a few times larger than the age of the universe. This can drastically change the thermal history of the universe. We investigate in detail the heating of the intergalactic medium in the period z = 100-z = 10. In particular, we find that the universe can be fully reionized for lifetime <=1024. This, in turn, lowers the level of temperature fluctuations of the background radiation. We conclude that this model avoids the major problems of the neutrino picture.
Asselin X.
Blanchard Alain
Girardi Georges
Salati Pierre
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