Averaging Einstein's Equations: The Linearized Case

Details Averaging Einstein's Equations: The Linearized Case Averaging Einstein's Equations: The Linearized Case

1999-04-07

arxiv.org/abs/gr-qc/9904020v1

Int.J.Mod.Phys.D16:1001-1026,2007

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

17 pages, prl revtex style

Scientific paper

10.1142/S0218271807010535

We introduce a simple and straight-forward averaging procedure, which is a generalization of one which is commonly used in electrodynamics, and show that it possesses all the characteristics we require for linearized averaging in general relativity and cosmology -- for weak-field and perturbed FLRW situations. In particular we demonstrate that it yields quantities which are approximately tensorial in these situations, and that its application to an exact FLRW metric yields another FLRW metric, to first-order in integrals over the local coordinates. Finally, we indicate some important limits of any linearized averaging procedure with respect to cosmological perturbations which are the result of averages over large amplitude small and intermediate scale inhomogeneities, and show our averaging procedure can be approximately implemented by that of Zotov and Stoeger in these cases.

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