Observational constraints on decaying vacuum dark energy model
arXiv:1102.3254 · doi:10.1140/epjc/s10052-011-1586-5
Abstract
The decaying vacuum model (DV), treating dark energy as a varying vacuum, has been studied well recently. The vacuum energy decays linearly with the Hubble parameter in the late-times, $Ï_Î(t) \propto H(t)$, and produces the additional matter component. We constrain the parameters of the DV model using the recent data-sets from supernovae, gamma-ray bursts, baryon acoustic oscillations, CMB, the Hubble rate and x-rays in galaxy clusters. It is found that the best fit of matter density contrast $Ω_m$ in the DV model is much lager than that in $Î$CDM model. We give the confidence contours in the $Ω_m-h$ plane up to $3Ï$ confidence level. Besides, the normalized likelihoods of $Ω_m$ and $h$ are presented, respectively. %
7 pages, 3 figures, accepted by European Physical Journal C