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Indexed by:期刊论文

Date of Publication:2011-10-01

Journal:EUROPEAN PHYSICAL JOURNAL PLUS

Included Journals:Scopus、SCIE

Volume:126

Issue:10

Page Number:1-13

ISSN No.:2190-5444

Abstract:The evolution of the universe in Brans-Dicke (BD) theory is discussed in this paper. Considering a parameterized scenario for BD scalar field phi = phi(0)a(alpha) which plays the role of gravitational constant G, we apply the Markov Chain Monte Carlo method to investigate a global constraints on BD theory with a self-interacting potential according to the current observational data: the Union2 dataset of type-Ia supernovae (SNIa), the high-redshift Gamma-Ray Bursts (GRBs) data, the observational Hubble data (OHD), the cluster X-ray gas mass fraction, the baryon acoustic oscillation (BAO), and the cosmic microwave background (CMB) data. It is shown that an expanded universe from deceleration to acceleration is given in this theory, and the constraint results of dimensionless matter density Omega(0m) and parameter alpha are, Omega(0m) = 0.286(-0.039-0.047)(+0.037+0.050) and alpha = 0.0046(-0.0171-0.0206)(+0.0149+0.0171) which is consistent with the result of current experiment exploration, vertical bar alpha vertical bar <= 0.132124. In addition, we use the geometrical diagnostic method, jerk parameter j, to distinguish the BD theory and the cosmological constant model in Einstein's theory of general relativity.