I have read these questions:
And it made me curious. None of these answer my question.
The mass of an object is the same as the energy the object possesses at rest. Mass and rest energy are the same convertible thing, E=mc^2. The mass of an atomic nucleus is less then the mass of its constituents, and this missing mass is the mass defect, which is equivalent to the energy needed to separate the protons and neutrons from a nucleus. This is because of the strong force and the residual strong force, the nuclear force.
In the case of the strong force, the carrier, the gluon is massless. In the case of the residual strong force, nuclear force, the carrier, the pion does have rest mass.
Now in the case of gravity, there could be the same mass defect, but the mass of the graviton is not decided yet, it should be massless because of the long range of the gravitational force.
I do not know if there has been any experiment about the mass defect of the gravitational force, but could it decide whether gravitons should have mass?
Has there been any experiment to prove or disprove the mass defect effect of gravity?
If there is a mass defect, could that decide whether the graviton should be massless?