Ultra-weak gravitational field detected
Maybe I am missing something, but how could a quantum theory of gravity explain curvature of spacetime? If a photon follows a curve around a large mass, it does so because that curve is the shortest path through spacetime, if I am not mistaken.<p>But how would a theoretical graviton explain this effect?  Would it interact with the photon to carry over a force? And if so, how would it "know" the direction of said force (wouldn't it be itself subject to gravity?). Or would it interact with space itself?