Cold dark matter under a cloud
Article Abstract:
New evidence against the cold-dark-matter (CDM) cosmological model has come to light in 1992. Cosmic microwave background radiation data from the COBE satellite lacked the variations forecast by the CDM model. G. Toth and J.P. Ostriker further undermined the CDM model by showing that it cannot explain the large-scale clustering of galaxies in the universe. However, this finding is not definitive due to the lack of clear data on what happens to dark matter when galaxies absorb it.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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The observational case for a low-density Universe with a non-zero cosmological constant
Article Abstract:
An analysis of the proposed models for the development of the Universe shows that the most accurate models are those in which the matter density of the Universe is much less than the corresponding energy density at which expansion stops. Measurements of cosmic background radiation show that flat cosmological models are better than open models. A universe with a certain critical density and a high value of cosmological constant is favoured over a constantly expanding Universe.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1995
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The spectrum of cosmological density fluctuations and nature of dark matter
Article Abstract:
An analysis of cosmological data found that only one structural formation model of the Universe was acceptable. Under this model the cosmic density equals one with 69% of matter being cold dark matter, 30% being hot dark matter created by stable neutrinos and 1% being baryonic matter. Some of the grand unified theories that have been put forward may allow for such a combined model. The COBE satellite and the QDOT IRAS redshift survey supplied the data.
Publication Name: Nature
Subject: Zoology and wildlife conservation
ISSN: 0028-0836
Year: 1992
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