Cosmological Constraints on Ghost Dark Energy in the Brans-Dicke Theory by Using MCMC Approach

Abstract

By using a Markov Chain Monte Carlo simulation, we investigate cosmological constraints on the ghost dark energy (GDE) model in the framework of the Brans-Dicke (BD) theory. A combination of the latest observational data of the cosmic microwave background radiation data from seven-year WMAP, the baryon acoustic oscillation data form the SDSS, the supernovae type Ia data from the Union2 and the X-ray gas mass fraction data from the Chandra X-ray observations of the largest relaxed galaxy clusters are used to perform constraints on GDE in the BD cosmology. In this paper, we consider both flat and non-flat universes together with interaction between dark matter and dark energy. The main cosmological parameters are obtained as: ${\Omega }_{\mathrm{b}}{h}^2=0.0223_{-0.0013}^{+0.0016}$, ${\Omega }_{\mathrm{c}}{h}^2=0.1149_{-0.0104}^{+0.0088}$ and ${\Omega }_{\mathrm{k}}=0.0005_{-0.0073}^{+0.0025}$. In addition, the Brans-Dicke parameter $\omega$ is estimated as $1/\omega \simeq 0.002$.

arXiv comment13 pages, 3 figures, 1 table, Accepted in Phys. Lett. B

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