Averaging from a global point of view

Abstract

We study the averaging problem from a point of view of variation of spatial volume $V$. We show that in the space of spherically symmetric dust solutions which are regular on the spatial manifold $S^3$ the variation $\delta V$ vanishes at the Friedmann-Lemaitre-Robertson-Walker (FLRW) solution in an appropriate sense, which supports the validity of the FLRW solution as the averaged solution. We also present the second variation ${\delta }^{2}V$, giving the leading effect of the deviation from the FLRW solution.

15 pages with 9 figures (REVTeX with epsf macro package), Minor corrections