define graviton in physics
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theories of quantum gravity, the graviton is the hypothetical quantum of gravity, an elementary particle that mediates the force of gravity. ... If it exists, the graviton is expected to be massless because the gravitational force is very long range and appears to propagate at the speed of light.
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Graviton, postulated quantum that is thought to be the carrier of the gravitational field. It is analogous to the well-established photon of the electromagnetic field. Gravitons, like photons, would be massless, electrically uncharged particles traveling at the speed of light.
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