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speed of gravity
In classical theories of gravitation, the speed of gravity is the speed at which changes in a gravitational field propagate. This is the speed at which a change in the distribution of energy and momentum of matter results in subsequent alteration, at a distance, of the gravitational field which it produces. In a more physically correct sense, the "speed of gravity" refers to the speed of a gravitational wave, which should be the same speed as the speed of light (''c'').
== Introduction ==
The speed of gravitational waves in the general theory of relativity is equal to the ''speed of light'' in vacuum, ''c''. Within the theory of special relativity, the constant ''c'' is not exclusively about light; instead it is the highest possible speed for any interaction in nature. Formally, ''c'' is a conversion factor for changing the unit of time to the unit of space.〔Taylor, Edwin F. and Wheeler, John Archibald, ''Spacetime Physics'', 2nd edition, 1991, p. 12.〕 This makes it the only speed which does not depend either on the motion of an observer or a source of light and/or gravity. Thus, the speed of "light" is also the speed of gravitational waves and any other massless particle. Such particles include the gluon (carrier of the strong force), the photons that make up light, and the theoretical gravitons which make up the associated field particles of gravity (however a theory of the graviton requires a theory of quantum gravity).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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