The late-time accelerated expansion of the universe is a major challenge for cosmology. It may well be that a solution to this problem will require a theory of gravitation beyond General Relativity. It is emphasized that precision cosmology will strongly constrain the possibilities by using observational data probing the background as well as the inhomogeneities.

The technique of replica casting of ceramic materials and the various methods of mounting and examination are described. Co-ordination of optical properties of the peels and X-ray analysis is considered. The uses of peels in showing orientation of clays settled under gravitation and also effects of plastic deformation are discussed.

This paper emphasizes certain little known aspects of Einstein's general theory of relativity. Although these features are of minor theoretical importance, their understanding and use can lead to the generation and control of gravitational forces. Three distinctly different nonNewtonian gravitational forces are described. The research areas which might lead to methods for the control of gravita...

It is shown that strings result naturally from considerations of gravitation. First, a Lorentz-covariant field formulation of gravitation in flat spacetime is developed. The requirement of covariance and the existence of a potential leads to an essentially unique theory based upon a symmetric, traceless, two-index tensor. The gravitational field possesses gauge invariance described by a second-...

Perturbations of the spherically symmetric collapsar in the relativistic theory of gravitation: axial perturbations. I Abstract Horizon solutions for the axial perturbations of the spherically symmetric collapsar are analyzed in the framework of the relativistic theory of gravitation. The gravitational perturbations can not be absorbed by the collapsar that results in the excitation of the new ...

The Einsteinian theory of gravitation is among the best-established theories ever conceived in physics [...]