Quantum field theory unified what two theory 's ?
So in contrast to any other QFT and string theory where the " gravitons " are the fundamental ( mathematical and physical ) entities in LQG the gravitons are not fundamental but only to be considered in a certain limited approximation.LQG differs from string theory in that it is formulated in 3 and 4 dimensions and without supersymmetry or Kaluza – Klein theory extra dimensions , while the latter requires both to be true .