Quote by Matterwave
A particular metric gives you the distance between infinitessimally close points. The FRW and Schwarzschild metrics are two different metrics which are both solutions for the EFE's for two different conditions. Schwarzschild metric is a so called vacuum solution which is valid outside a spherical mass distribution. FRW metric is a solution for a homogeneous and isotropic distribution of dust (perfect fluid).

But from linearized gravity concept (where curved spacetime = flat spacetime + spin2 fields) which you are familiar with in our discussions in the other threads. FRW metric can be modelled as Flat spacetime + spin2 fields. Since the flat spacetime has a version called Milne universe. Then FRW Metric is really just Milne Universe + Spin2 fields. Do you agree or object to this and why?