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Scientific paper
Mar 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ppu..conf..221e&link_type=abstract
PARTICLE PHYSICS AND THE UNIVERSE. Proceedings of Nobel Symposium 109. Held 20-25 August 1998 in Haga Slott, Enköping, Sweden. E
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Unified Theories And Models Of Strong And Electroweak Interactions, Supersymmetric Models, Neutrino Mass And Mixing, Supersymmetric Partners Of Known Particles, Neutrino, Muon, Pion, And Other Elementary Particles, Cosmic Rays, Particle-Theory And Field-Theory Models Of The Early Universe, Observational Cosmology
Scientific paper
Some particle candidates for dark matter are reviewed in the light of recent experimental and theoretical developments. Models for massive neutrinos are discussed in the light of the recent atmospheric-neutrino data, and used to motivate comments on the plausibility of different solutions to the solar neutrino problem. Arguments are given that the lightest supersymmetric particle should be a neutralino χ, and accelerator and astrophysical constraints used to suggest that 50GeV ≲ mχ ≲ 600 GeV. Minimizing the fine tuning of the gauge hierarchy favours Ωχh2 ~ 0.1. The possibility of superheavy relic particles is mentioned, and candidates from string and M theory are reviewed. Finally, the possibility of non-zero vacuum energy is discussed: its calculation is a great opportunity for a quantum theory of gravity, and the possibility that it is time dependent should not be forgotten.
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