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Astrophysics

Title: Determination of Cosmological Parameters

Abstract: Rapid progress has been made recently toward the measurement of cosmological parameters. Still, there are areas remaining where future progress will be relatively slow and difficult, and where further attention is needed. In this review, the status of measurements of the matter density, the vacuum energy density or cosmological constant, the Hubble constant, and ages of the oldest measured objects are summarized. Many recent, independent dynamical measurements are yielding a low value for the matter density of about 1/3 the critical density. New evidence from type Ia supernovae suggests that the vacuum energy density may be non-zero. Many recent Hubble constant measurements appear to be converging in the range of 65-75 km/sec/Mpc. Eliminating systematic errors lies at the heart of accurate measurements for all of these parameters; as a result, a wide range of cosmological parameter space is currently still open. Fortunately, the prospects for accurately measuring cosmological parameters continue to increase.
Comments: Invited Review given at the Nobel Symposium, "Partical Physics and the Universe, Haga Slott, Sweden, August 1988, to be published by World Scientific Press. 17 pages, 7 figures. Submitted Feb. 1999
Subjects: Astrophysics (astro-ph)
Journal reference: Phys.Scripta T85 (2000) 37-46
DOI: 10.1238/Physica.Topical.085a00037
Cite as: arXiv:astro-ph/9905222
  (or arXiv:astro-ph/9905222v1 for this version)

Submission history

From: Wendy L. Freedman [view email]
[v1] Tue, 18 May 1999 00:31:51 GMT (126kb)