Hi guys, I don´t understand too much the newtonian limit of General Relativity. My question is: In this limit ga b (x) = ηa b (x) + ha b (x) where O(h2→0). Then, according to GR, it's straightforward to demonstrate that the Einstein equation Gt t = k*Tt t in that limit leads to Poisson equation (here we have considered Λ = 0 and the energy-stress tensor of a perfect fluid with null pressure), but what about the other components of these equations?? I've read in many books that they are neglected but I don't agree with this. For example, according to this limit in 4 dimensions we have R = -k*T ≠ 0 and there is not any reason to neglect it, so Gr r ≠ k*Tr r. What's happening here?? Thanks in advanced and forgive my english.