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Elementary particle of spin 2 (a boson) that is believed to be responsible for the propagation of the gravitational interaction. Its rest mass is zero and so it moves at the speed of light. If a massless particle did not travel at the speed of light then there would be some frame of reference within which it would be at rest. In such a case, its total energy would be exactly zero and it would violate the principle that everything which exists embodies some form of energy. |
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Elementary particle of spin 2 (a boson) and rest mass zero, that is believed to be responsible for the propagation of the gravitational interaction, although it has not yet been detected. |
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