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Massless particle
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=== Hypothetical graviton === The [[graviton]] is a hypothetical [[boson#tensor_boson_anchor|tensor boson]] proposed to be the carrier of [[gravitational force]] in some [[quantum gravity|quantum theories of gravity]], but no such theory has been successfully incorporated into the [[Standard Model]], so the Standard Model neither predicts any such particle nor requires it, and no gravitational quantum particle has been indicated by experiment. Whether a graviton would be massless if it existed is likewise an open question.
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