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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.
D. Puy (Thu,) studied this question.
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