the same for what is the dark matter and the dark energy, we have no proof of what they are really, we have just models and ideas, assumptions. We have not solved the QG, the gluons problems, the constant cosmological problem, this and that, in fact it is mainly due to this prison that I explained, we must think beyond the box of this GR and photons alone, I don t understand what is the problem but maybe the thinkers forget to see farer than all this.
You speak about the renormalisation of this QG, you see well that we cannot sort the divergences and these3 infinities if wqe consider the GR and photons, the problem is to consider like I said this pseudo riemanian variety and the GR and the fact to consider that these gravitons are the quanta of these gravitational waves. The problem is philosophical in trying to unify G c and h and in considering the gravitation like a curvature of this spacetime like a deformation of this spacetime due to a energetical sources and so in the case of gravitons like quanta of these gravit waves so more you add gravitons more the curvature appears but it is not possible simply philosophically and in a pure renromalisation point of vue because they interact with themselves infinite;lly and all has been tries. That implies that this QG has nothing to do with our actual QFT and the works of feynman or dirac shall not change the fact this non renormalibility.
It is the same with the singularities for example they don t exist in fact and the confusion is still due to this GR like general primary essence . The same for the planck scale wich is a mathematical extrapolation simply where the laws are broken, so the aim is not to unify G c and h, it is more deep than this , and this DM and DE are there to help.
PS the foundamental problem is so the non renormalisation due to fact all source of E creates so consiedring this GR a gravitational field and so these gravitons interact with themselves at infinitelly and all mathematical tools invencted to solve this even the nmon commutativity cannot solve the problem simply because the general philosophy is false , are you conscious of this.