出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We investigate the evolution of a universe with a decaying cosmological term (vacuum energy)
that is assumed to be a function of the scale factor. In this model, while the cosmological term
increases to the early universe, the radiation energy density is lower than the model with the cosmological
"constant". We find that the effects of the decaying cosmological term on the expansion
rate at the redshift z < 2 is negligible.
However, the decrease in the radiation density affects on the thermal history of the universe;
e.g. the photon decoupling occurs at higher z compared to the case of the standard LCDM
model. As a consequence, a decaying cosmological term affects on the cosmic microwave background
anisotropy. We show the angular power spectrum in DLCDM model and compare with
the Wilkinson Microwave Anisotropy Probe (WMAP) data.
