There exist gravitational memory effects in Brans-Dicke theory. They are closely related to the Bondi-Metzner-Sachs symmetries living on null infinity an isolated system. By studying asymptotically flat spacetime theory and asymptotic symmetries, one discovers that displacement effect tensor sector is due vacuum transition caused by energy fluxes panetrating infinity, while scalar sector, angul...

Radio Doppler data from the Cassini spacecraft during its solar conjunction in June 2002 can be used to measure the bending of light by solar gravitation. In terms of the standard post-Newtonian parameter γ, we find that γ − 1 = (−1.3 ± 5.2) × 10, in agreement with the theory of General Relativity. This result implies that the parameter ω in the Brans-Dicke theory is greater than 9000 at a 95% ...

A recent investigation shows that a local gauge string with a phenomenological energy momentum tensor, as prescribed by Vilenkin, is inconsistent in Brans-Dicke theory. In this work it has been shown that such a string is consistent in a more general scalar tensor theory where ω is function of the scalar field.A set of solutions of full nonlinear Einstein's equations for interior region of such...

It is shown some exact solutions in the Brans-Dicke (BD) theory for a Bianchi V metric having the property of inflationary expansion, graceful exit, and asymptotic evolution to a Friedmann-Robertson-Walker (FRW) open model. It is remarkable that an inflationary behaviour can occur, even without a cosmological potential or constant. However, the horizon and flatness problems cannot be solve with...

We consider a 5-dimensional scalar-tensor theory which is a direct generalization of the original 4-dimensional Brans-Dicke theory to 5-dimensions. By assuming that there is a hypersurface-orthogonal spacelike Killing vector field in the underlying 5-dimensional spacetime, the theory is reduced to a 4-dimensional theory where the 4-metric is coupled with two scalar fields. The cosmological impl...

In the present work, the gravitational field of a vacuum less global monopole has been investigated in Brans-Dicke theory under weak field assumption of the field equations. It has been shown that the vacuum less global monopole exerts attractive gravitational effects on a test particle. It is dissimilar to the case studied in general relativity.

We use the technique of conformal transformations to generate self-similar collapse in Brans-Dicke theory. We analyze the solutions concerning the critical behavior found recently by Choptuik. The critical exponent associated to the formation of black hole for near critical evolution is obtained. The role of the coupling parameter is discussed.

Flavor oscillations of neutrinos are analyzed in the framework of Brans–Dicke theory of gravity. We find a shift of quantum mechanical phase of neutrino proportional to GN∆m and depending on the parameter ω. Consequences on atmospheric, solar and astrophysical neutrinos are discussed. PACS: 14.60Pq, 95.30.Sf, 04.50+h

We discuss the gravitomagnetic time delay and the Lense-Thirring effect in the context of Brans-Dicke theory of gravity. We compare the theoretical results obtained with those predicted by general relativity.We show that within the accurarcy of experiments designed to measure these effects both theories predict essentially the same result.

We have studied the Generalised Brans-Dicke theory and obtained exact solutions of a(t),φ(t), and ω(t) for different epochs of the cosmic evolution. We discuss how inflation,decceleration,cosmic acceleration can result from this solution.The time variation of G(t) is also examined .