Thermal balance in decaying cosmologies
Geneva Observatory, University of Geneva, Chemin des Maillettes 51, 1290 Sauverny, Switzerland
Corresponding author: Denis.Puy@obs.unige.ch
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