Einstein's Geometry and Tests

General Relativity is the theory of gravity that incorporates special relativity and the weak equivalence principle which states that accelerating frames of reference and gravitational fields are indistinguishable. It is a metric theory, sometimes also called a geometric theory. Metric theories describe physical phenomena in terms of differential geometry.This stands in contrast to Isaac Newton's Law of Universal Gravitation, which described gravity in terms of a vector field. The equivalence…