General relativity or the general theory of relativity is the
geometric theory of gravitation published by Albert Einstein in
1915. It is the current description of gravitation in modern
physics. General relativity generalises special relativity and
Newton's law of universal gravitation, providing a unified
description of gravity as a geometric property of space and time,
or spacetime. In particular, the curvature of spacetime is directly
related to the four-momentum (mass-energy and linear momentum) of
whatever matter and radiation are present. The relation is
specified by the Einstein field equations, a system of partial
differential equations. Einstein's theory has important
astrophysical implications. For example, it implies the existence
of black holes-regions of space in which space and time are
distorted in such a way that nothing, not even light, can escape-as
an end-state for massive stars. There is evidence that such stellar
black holes as well as more massive varieties of black hole are
responsible for the intense radiation emitted by certain types of
astronomical objects such as active galactic nuclei or
microquasars.
General
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