| Issue |
A&A
Volume 422, Number 1, July IV 2004
|
|
|---|---|---|
| Page(s) | 1 - 9 | |
| Section | Cosmology (including clusters of galaxies) | |
| DOI | https://doi.org/10.1051/0004-6361:20040256 | |
| Published online | 06 July 2004 | |
Thermal balance in decaying 
cosmologies
Geneva Observatory, University of Geneva, Chemin des Maillettes 51, 1290 Sauverny, Switzerland
Corresponding author: Denis.Puy@obs.unige.ch
Received:
12
February
2004
Accepted:
26
February
2004
We consider cosmological models in which the vacuum decay energy is channeled
exclusively into radiation. We investigate the thermal evolution of the Universe with a variable cosmological term
which varies as a function of the scale factor a as 
.
Using constraints given by the temperature measurements of the cosmic microwave background, at redshifts
between 
and 
, we find that 
models
are clearly ruled out. The influence on the thermal decoupling between matter and radiation is also discussed.
Key words: cosmology: theory / cosmic microwave background
© ESO, 2004
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