Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997japa...18..271t&link_type=abstract
Journal of Astrophysics and Astronomy, Vol. 18, p.271
Astronomy and Astrophysics
Astrophysics
2
Scientific paper
The fundamental properties of Friedman Universes, which are attractive because of their simplicity, are linear expansion (except for deceleration), cooling, and evolution. In addition it is assumed that the fundamental constants of physics are constant and that the known laws of physics apply (including GR). An increasing number of observational tests support these premises. In particular the expansion is as linear as can be tested. The present expansion rate (H(sub zero) = 55 (plus or minus) 10 km s(sup -1) Mpc(sup -1) implies an expansion age of 17.8 (plus or minus) 3.2 Gyr (for q(sub zero) = 0) to 11.9 (plus or minus) 2.1 Gyr (for q(sub zero) = 1/2). This agrees perfectly within the errors, even for a critical Universe, with present age determinations of the oldest objects in the Galaxy which require 13.5 (plus or minus) 2 Gyr.
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