In QFT, the other 3 fundamental forces (electromagnetism, weak and strong nuclear forces) are interpreted as being mediated by quanta of their particular field, what we call bosons or "force carrier particles". These mediate the relevant force between particles. As I understand it, one completely isolated particle can not mediate the force. The force is an interaction between 2 particles. No "receiving particle" = no force to talk about. With gravity, if we assume the same principle, it should mean that the graviton is the quantum of the gravitation field, the force carrier for gravity. But if we assume the same principle, it would seem that also, no receiving particle for the gravitons = no actual force to talk about. And yet, we think about spacetime around a massive object being warped, no matter if its gravitation is "felt" by any other objects or not. We seem to assume that gravity is different to the other forces in that it does not need a "receiver" to become actual. Gravity exerts its influence in its surrounding spacetime, it warps spacetime around it, regardless if there is any other matter around to be influenced by its gravitational influence or not. Do I get it right, and if so, what does it tell us about the difference between gravity and the other forces?