Observational constraints on a decaying cosmological term

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dc.creatorNakamura, Riou
dc.creatorHashimoto, Masa-aki
dc.creatorIchiki, Kiyotomo
dc.date2006-11-08
dc.date2007-03-12
dc.date.accessioned2026-07-07T10:24:13Z
dc.date.available2026-07-07T10:24:13Z
dc.descriptionWe 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 ΛCDM model. As a consequence, a decaying cosmological term affects on the cosmic microwave background anisotropy. We show the angular power spectrum in DΛCDM model and compare with the Wilkinson Microwave Anisotropy Probe (WMAP) data.
dc.description5 pages, 3 figures, Proceedings of International Symposium on Nuclear Astrophysics -Nuclei in the Cosmos IX-, CERN, Geneva, June 25-30, 2006
dc.identifierhttps://arxiv.org/abs/astro-ph/0611258
dc.identifierhttp://arxiv.org/abs/astro-ph/0611258
dc.identifierPoSNIC-IX:149,2006
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/176107
dc.subjectAstrophysics
dc.titleObservational constraints on a decaying cosmological term
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