Eur. Phys. J. C (2011) 71: 1586
https://doi.org/10.1140/epjc/s10052-011-1586-5

Regular Article - Theoretical Physics

Observational constraints on decaying vacuum dark energy model

Korea Astronomy and Space Science Institute, Daejeon, 305-348, Korea

^* e-mail: mltong@mail.ustc.edu.cn

Received: 14 January 2011
Published online: 1 March 2011

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, 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.