Regular Article - Theoretical Physics
Observational constraints on decaying vacuum dark energy model
Korea Astronomy and Space Science Institute, Daejeon, 305-348, Korea
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Published online: 1 March 2011
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, ρ Λ (t)∝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 the matter density contrast Ω m in the DV model is much lager than that in ΛCDM model. We give the confidence contours in the Ω m –h plane up to 3σ confidence level. Besides, the normalized likelihoods of Ω m and h are presented, respectively.
© Springer-Verlag / Società Italiana di Fisica, 2011