Cosmological constraints on ghost dark energy in the Brans–Dicke theory by using MCMC approach

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: Ωbh2=0.0223−0.0013+0.0016, Ωch2=0.1149−0.0104+0.0088 and Ωk=0.0005−0.0073+0.0025. In addition, the Brans–Dicke parameter ω   is estimated as 1/ω≃0.0021/ω≃0.002.