Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 312, Issue 4, Pages 747-752Publisher
OXFORD UNIV PRESS
DOI: 10.1046/j.1365-8711.2000.03172.x
Keywords
galaxies : distances and redshifts; cosmic microwave background; cosmology : theory
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The radiation temperature-redshift relation for Friedmann-Robertson-Walker geometries is rediscussed in connection with recent observational data based on the fine-structure splitting of atomic and singly ionized carbon lines in quasar absorption-line systems. Indirect measurement of T(z) is one of the most powerful cosmological tests available because it may exclude even the presence of a cosmological constant. Unlike recent claims, we argue that the temperature at high z may be smaller than the standard prediction, thereby opening a window to alternative (big bang) models. By including new ingredients like a phenomenological decaying vacuum energy density and gravitational 'adiabatic' photon creation as well as late inflationary models driven by a scalar field, a new temperature law is deduced and its predictions are compared with the standard result.
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