I expressed that badly. I was thinking along these lines:
A photon is the quantum of the EM force, so it cannot be divided, but a photon can give rise to two photons carrying less energy.
A graviton would be the quantum of gravity. Could a graviton (hypothetically) divide to become two gravitons, each carrying less energy? The quote “Gravitons participate in the gravitational field, which means that a graviton can emit gravitons”, suggests that this might be the case.
If gravity creates gravity, and gravitons participate in this, does one graviton create another? If so, the process of creating more gravity must mean that there is more gravitational energy in the system after graviton A has created graviton B than there was before. Where would the additional energy come from?
