Marco Bruni                                  GGI Florence, October 2006
Energy cons. & effective rL
4.Note that:                  , thus                               .
5.Assume                and Taylor expand:


6.Then:
a)At O(1) in Dr and O(0) in a, in any theory of gravity, any P(r) that admits an effective rL behaves as        L-CDM (Dr>0);
b)For a > -1 r -> rL, i.e. rL is a de Sitter attractor.
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From energy cons. -> Cosmic No-Hair for non-linear EoS.