Physics – High Energy Physics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990iupa.conf....2s&link_type=abstract
Presented at the 25th IUPAP International Conference on High Energy Physics, Singapore, 2-8 Aug. 1990
Physics
High Energy Physics
Big Bang Cosmology, Neutrinos, Nuclear Fusion, Particle Interactions, Radioactive Decay, Astronomical Models, Phase Transformations, Relic Radiation
Scientific paper
The standard model of cosmology, the big bang, is now being tested and confirmed to remarkable accuracy. Recent high precision measurements relate to the microwave background; and big bang nucleosynthesis, which is studied since it relates more directly to high energy experiments. In particular, the recent LEP (and SLC) results on the number of neutrinos are discussed as a positive laboratory test of the standard cosmology scenario. Discussion is presented on the improved light element observational data as well as the improved neutron lifetime data. Alternate nucleosynthesis scenarios of decaying matter or of quark-hadron induced inhomogeneities are discussed. It is shown that when these scenarios are made to fit the observed abundances accurately, the resulting conclusions on the baryonic density relative to the critical density, Omegab, remain approximately the same as in the standard homogeneous case, thus, adding to the robustness of the standard model conclusion that Omegab approx. 0.06. This latter point is the deriving force behind the need for non-baryonic dark matter (assuming Omegatotal = 1) and the need for dark baryonic matter, since Omegavisible less than Omegab. Recent accelerator constraints on non-baryonic matter are discussed, showing that any massive cold dark matter candidate must now have a mass Mx approx. greater than 20 GeV and an interaction weaker than the Z0 coupling to a neutrino. It is also noted that recent hints regarding the solar neutrino experiments coupled with the see-saw model for micromasses may imply that the nutau is a good hot dark matter candidate.
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