Unified Dark Fluid and Cosmic Transit Models in Brans-Dicke Theory
arXiv:2004.01027 · doi:10.1016/j.dark.2020.100722
Abstract
Some dark energy cosmological models are constructed in the framework of a generalised Brans-Dicke theory which contains a self interacting potential and a dynamical coupling parameter. The dark sector of the universe is considered through a unified linear equation of state. The parameters of the unified dark fluid have been constrained from some physical basis. Since the universe is believed to have undergone a transition from an early deceleration to a late time acceleration, the deceleration parameter should have a signature flipping behaviour at the transition redshift. We have used a hybrid scale factor to simulate the dynamical behaviour of the deceleration parameter. Basing upon the observational constraints on the transition redshift, we have constructed four different transitioning dark energy models. The constructed models are confronted with observational data. For all the models, the behaviour of the dynamical scalar field, Brans-Dicke parameter, Self interacting potential are investigated. Also, on the basis of the generalised Brans-Dicke theory, we have estimated the time variation of the Newtonian gravitational constant.
17pages, 12 figures
References in corpus (18)
- Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
- f(R,T) gravity
- New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
- Spectra and Light Curves of Six Type Ia Supernovae at 0.511 < z < 1.12 and the Union2 Compilation
- Einstein's Other Gravity and the Acceleration of the Universe
- Baryon Acoustic Oscillations in the Ly-α forest of BOSS quasars
- SNLS3: Constraints on Dark Energy Combining the Supernova Legacy Survey Three Year Data with Other Probes
- A kinematical approach to dark energy studies
- The cosmological constant from the ghost. A toy model
- Observational signatures of Jordan-Brans-Dicke theories of gravity
- DM: Observational constraints on unified dark matter with constant speed of sound
- Cosmological constraints on coupled dark energy
- Constraining a possible time-variation of the gravitational constant through "gravitochemical heating" of neutron stars
- Role of Brans-Dicke Theory with or without self-interacting potential in cosmic acceleration
- Late time Acceleration and Role of Skewness in Anisotropic models
- Observational constraints on unified dark matter including Hubble parameter data
- Cosmological Constraints on Ghost Dark Energy in the Brans-Dicke Theory by Using MCMC Approach
- Generalized Brans-Dicke inflation with a quartic potential