Marco Bruni                                  GGI Florence, October 2006
Energy cons. & effective rL
§Covariant energy conservation:


§Note: phantom if r+P(r)<0
§Remarks:
1.If for a given EoS function P=P(r) there exists a rL such that P(rL) = - rL, then rL has the dynamical role of an effective cosmological constant.
2.A given non-linear EoS P(r) may admit more than one point rL. If these points exist,  they  are fixed points of the energy conservation equation.