gptejms
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Garth said:It is the average gravitational field of the whole universe that we are talking about. Remember in the cosmological solution we are dealing with a homogeneous density smoothed out over space.
If the expression "evolving cosmological gravitational field" means anything, which is my way of translating your expression in the OP: "As we go back into the past, things become nearer and nearer--so gravitational fields become higher and higher", then it also refers to
R(t).
Garth
For non-gravitating bodies moving away from one another(described by Milne metric as you say) the average gravitational field is zero.But there must be an "evolving cosmological gravitational field" according to your definition.How do you explain this?