The best-fit universe
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Ep 1 Waking Up in the Universe...
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now available free online, courtesy of The Richard Dawkins Foundation for Reason and Science. The en...
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Universe
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Ταξίδι στο Σύμπαν, από το Αμερικανικό Μουσείο Φυσικής ...
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Is the Universe Full of Life? ...
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In this University of Southern California program, Robert Kuhn hosts a group of distinguished paneli...
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The Size of Universe ep 05
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Professor Russell Stannard investigates what is beyond the observable universe and explores claims t...
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19 Omega and the End of the Un...
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Frontiers/Controversies in Astrophysics (ASTR 160) Class begins with a review of the issues previous...
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NASA
(13.33%) (3 Votes)Views: (1516) Date: (1991) Pages: () -
Author: Turner Michael S.
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Abstract: Inflation provides very strong motivation for a flat Universe, Harrison-Zel'dovich (constant-curvature) perturbations, and cold dark matter. However, there are a number of cosmological observations that conflict with the predictions of the simplest such model: one with zero cosmological constant. They include the age of the Universe, dynamical determinations of Omega, galaxy-number counts, and the apparent abundance of large-scale structure in the Universe. While the discrepancies are not yet serious enough to rule out the simplest and most well motivated model, the current data point to a best-fit model with the following parameters: Omega(sub B) approximately equal to 0.03, Omega(sub CDM) approximately equal to 0.17, Omega(sub Lambda) approximately equal to 0.8, and H(sub 0) approximately equal to 70 km/(sec x Mpc) which improves significantly the concordance with observations. While there is no good reason to expect such a value for the cosmological constant, there is no physical principle that would rule out such.
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