Titlebook: Sources and Detection of Dark Matter and Dark Energy in the Universe; Fourth International David B. Cline Conference proceedings 2001 Sprin

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The Cosmological Constant Problems present mass density. Several approaches to these problems are reviewed. Quintessence does not help with either; anthropic considerations offer a possibility of solving both. In theories with a scalar field that takes random initial values, the anthropic principle may apply to the cosmological cons

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Dust versus Supernova Cosmology Ia super-novae. First we argue that the currently available data do not robustly exclude the cosmologically significant extinction either by the reddening check or the dispersion argument because of the observational uncertainties, even in the case of ordinary dust that reddens. Then we discuss two

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Measurement of the Cosmological Constant from Galactic Velocity Rotation Datactic Velocity Rotation Curves can be interpreted as that due to the Cosmological Constant Λ. The experimentally determined values for Λ are found to be consistent with those expected from Cosmological Constraints. The Cosmological Constant is interpreted as leading to a constant energy density which

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heirloom

Light Scalars in Cosmologyh have important cosmological implications. Although these corrections can be kept under control, the resulting constraints are not too natural. In particular, to keep the quintessence field light one must essentially decouple it from ordinary matter. Some possible suggestions of how to avoid these

BARGE

Optimal Supernova Search Strategies parameters Ω., Ω. and ω.. In this work we address the question: what is the optimal distribution of supernovae in redshift in order to best constrain the cosmological parameters? The solution to this problem is not only of theoretical interest, but can be useful in planning supernova searches. Usin