In this work, we present a Big Rip scenario within the framework of generalized Brans-Dicke (GBD) theory. GBD theory, consider an evolving BD parameter along with self-interacting potential. An anisotropic background is considered to have more general view cosmic expansion. The theory cosmological constant presented as effective fluid relativity which favours phantom field dominated phase. mode...

We show that rapid primordial inflation and slow asymptotic inflation is a natural consequence of Brans-Dicke theory. The ratio of the two inflation parameters is proportional to the square root of the Brans-Dicke parameter ω (ω ≫ 1). We also calculate the Hubble parameter H and the time variation of the time dependent Newtonian gravitational constant G for both regimes. The variation of the Hu...

We consider two-dimensional Brans-Dicke theory to study the initial singularity problem. It turns out that the initial curvature singularity can be finite for a certain Brans-Dicke constant ω by considering the quantum back reaction of the geometry. For ω = 1, the universe starts with the finite curvature scalar and evolves into the flat spacetime. Furthermore the divergent gravitational coupli...

We study the effect of the solitonic degree of freedom in string cosmology following the line of Rama. The gas of solitonic p-brane is treated as a perfect fluid in a Brans-Dicke type theory. In this paper, we find exact cosmological solutions for any Brans-Dicke parameter ω and for general parameter γ of equation of state and classify the the cosmology of the solutions according to the paramet...

We study the dynamics of false vacuum bubbles in the Brans-Dicke theory of gravity by using the thin shell or thin wall approximation. We consider a false vacuum bubble that has a different value for the Brans-Dicke field between the inside false vacuum region and the outside true vacuum region. Within a certain limit of field values, the difference of field values makes the effective tension o...

Machian solutions of which the scalar field exhibits the asymptotic behavior φ = O(ρ/ω) are generally explored for the homogeneous and isotropic universe in the Brans-Dicke theory. It is shown that the Machian solution is unique for the closed and the open space. Such a solution is restricted to one that satisfies the relation GM/c2a = const, which is fixed to π in the theory for the closed mod...