EMDrives are claimed to be propellentless space propulsion systems. If propellentless propulsion is possible it could enable fast human travel throughout the solar system and possible interstellar ...

Scalar-tensor gravity represents a class of extensions to Einstein’s theory of general relativity in which the gravitational interaction is mediated not only by the spacetime metric but also by one or ...

Scalar-tensor cosmology extends Einstein’s theory of gravitation by introducing a dynamical scalar field that mediates part of the gravitational interaction alongside the metric tensor. These models ...

The gravitational field on Earth varies not only with latitude, but also with altitude and in other ways, particularly due to crustal thickness and the fact that the Earth's crust effectively floats ...