Thanks the above kind of paper is what I'm looking for. So in strong fields, flat spacetime with spin 2 fields can't model such things like Black Holes. Now the reason I'm asking is because I'd like to know whether a quantum theory of gravity.. or quantum gravity can produce the degrees of freedom where the spin-2 versions in flat spacetime can model strong fields too. I mean quantum gravity is supposed to address beyond planck scale. But how about strong fields like between the event horizon and the boundary of the planck scale. Can a quantum gravity theory enable spin-2 over flat spacetime in strong fields such as between event horizons and near planck scale too in contrast to normal Field Theory of Gravitation? This is my main question.