Accelerating universe with the effect of anisotropy on dark energy model in the framework of Brans–Dicke theory
Abstract
This study set out to investigate the effect of anisotropy on the ΛΛCDM model in the framework of Brans−Dicke theory. To this end, astrophysical constraints on this model using current available data including type Ia supernovae (SNIa), the Baryon Acoustic Oscillation (BAO), and the Hubble parameter H(z)H(z) data were deployed. Here, we present combined results from these probes, deriving constraints on Ωσ0Ωσ0 of ΛΛCDM model and its anisotropy energy density in an anisotropic universe. It is found that Ωσ0Ωσ0 can be constrained by the SNIa+H(z)+BAOSNIa+H(z)+BAO data, with the best fitting value Ωσ0=(−6.52±4.21)×10−4Ωσ0=(−6.52±4.21)×10−4 for the Brans–Dicke cosmology. We extend our study to the case of ΛΛCDM model in an anisotropic universe and Brans–Dicke framework and find out that the equation of state parameter (ωΛωΛ) cannot cross the phantom line and eventually the universe approaches a quintessence era.
