Thermal balance in decaying Λ cosmologies

Details Thermal balance in decaying Λ cosmologies Thermal balance in decaying Λ cosmologies

Jul 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...422....1p&link_type=abstract

Astronomy and Astrophysics, v.422, p.1-9 (2004)

Astronomy and Astrophysics

Astrophysics

9

Cosmology: Theory, Cosmic Microwave Background

Scientific paper

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 ΩΛ=ΩΛ,1+ ΩΛ,2 a-m. Using constraints given by the temperature measurements of the cosmic microwave background, at redshifts between z=0 and z=4, we find that \forall m ≠q 0 ΩΛ = ΩΛ,0 a-m models are clearly ruled out. The influence on the thermal decoupling between matter and radiation is also discussed.

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