Physics – Nuclear Physics
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nuphs..77..420c&link_type=abstract
Nuclear Physics B Proceedings Supplements, Volume 77, Issue 1-3, p. 420-426.
Physics
Nuclear Physics
Scientific paper
The missing mass of the universe is likely to consist of at least three components: baryons, neutrinos, and a particle which was weakly interacting and slow moving (``cold'') in the early universe. It is doubtful that the baryonic candidates observed by microlensing could be an appreciable part of our local dark matter halo. The dominant cold component might be the supersymmetric neutralino, and if so, recent accelerator constraints making this more gaugino-like should make direct detection of the dark matter particle easier. Despite recent observations favoring a low-density universe, such a model (even with the addition of a cosmological constant) does not fit universe structure. The only model which does has a critical density, 20% neutrinos, 10% baryons, and 70% cold dark matter. The data are fit better if the neutrino dark matter is shared between two neutrino species (νμ and ντ) rather than one, a mass pattern which also explains the solar and atmospheric neutrino deficits and the LSND experiment. It is shown here that KARMEN and other experiments do not conflict with the LSND results in the appropriate mass region. Further support for this mass pattern is provided by the need for a sterile neutrino to rescue heavy-element nucleosynthesis in supernovae.
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