A case for the standard model |
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| Authors: | G A Tammann |
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| Institution: | 1. Astronomisches Institut der Universit?t Basel, Venusstr. 7, CH-4102, Binningen, Switzerland
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| Abstract: | The fundamental properties of Friedmann 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
0 = 55 ± 10 km s-1 Mpc-1) implies an expansion age of 17.8 ± 3.2 Gyr (forq
0 = 0) to 11.9 ± 2.1 Gyr (for q0 = 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 ± 2 Gyr. |
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