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How can gravitons be emitted from a mass to cause an attractive force to another mass? The same question could be asked of attractive e-m forces as well. Don't these violate the conservation of momentum (not of the masses themselves, but of the particles mediating the forces)?

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    $\begingroup$ Possible duplicates: physics.stackexchange.com/q/171564/2451 and links therein. $\endgroup$ – Qmechanic Jan 4 '16 at 19:13
  • $\begingroup$ The notion of a field is introduced to salvage the conservation of energy and momentum. The field acts as a reservoirs of both the quantities, which are mediated by the quanta of the field (on a quantum level). $\endgroup$ – Phoenix87 Jan 4 '16 at 19:13
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    $\begingroup$ Please see my answer here physics.stackexchange.com/q/227218 to understand that the exchanged "particles" are mathematical representations in Feynman diagrams, not real particles with a fixed mass. $\endgroup$ – anna v Jan 4 '16 at 19:13
  • $\begingroup$ The reason why the mental model breaks down is because it is wrong to begin with. Force mediating bosons don't "move", they are measurement values on a field. $\endgroup$ – CuriousOne Jan 4 '16 at 19:14
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    $\begingroup$ Maybe the graviton is the wild goose $\endgroup$ – Bill Alsept Jan 4 '16 at 20:46

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