We consider a modified “Swiss cheese” model in the Brans-Dicke theory, and discuss the evolution of black holes in the expanding universe. We define the black hole radius by the Misner-Sharp mass and find the time evolution for dust and vacuum universes.

We present calculations of Post-Newtonian parameters for Brans-Dicke tensor-scalar gravity in an arbitrary number of compact extra dimensions in both the Jordan and Einstein conformal frames. We find that the parameter γ, which measures the amount of spacetime curvature per unit mass, becomes a function of ω, the coefficient of the scalar kinetic term in the Brans-Dicke Lagrangian. Experiment h...

We study the structure and stability of the recently discussed spherically symmetric Brans-Dicke black-hole type solutions with an innnite horizon area and zero Hawking temperature , existing for negative values of the coupling constant !. These solutions split into two classes: B1, whose horizon is reached by an infalling particle in a nite proper time, and B2, for which this proper time is in...

We treat a very crude model of an exploding star, in the weak field approximation of the Brans-Dicke theory, in a scenario that resembles some characteristics data of a Type Ia Supernova. The most noticeable feature, in the electromagnetic component, is the relationship between the absolute magnitude at maximum brightness of the star and the decline rate in one magnitude from that maximum. This...

In the context of Brans-Dicke scalar tensor theory of gravitation, the cosmological Friedmann equation which relates the expansion rate H of the universe to the various fractions of energy density is analyzed rigorously. It is shown that BransDicke scalar tensor theory of gravitation brings a negligible correction to the matter density component of Friedmann equation. Besides, in addition to ΩΛ...

In the context of Brans-Dicke scalar tensor theory of gravitation, the cosmological Friedmann equation which relates the expansion rate H of the universe to the various fractions of energy density is analyzed rigorously. It is shown that BransDicke scalar tensor theory of gravitation brings a negligible correction to the matter density component of Friedmann equation. Besides, in addition to ΩΛ...