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 ...

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 theories generalise Einstein’s general relativity by introducing one or more scalar fields that couple nonminimally to the metric. These scalar degrees of freedom can mediate long-range ...

After Albert Einstein published his special theory of relativity in 1905, he spent the next decade trying to come up with a theory of gravity. But for years, he kept running up against a problem. He ...